{"id":7445,"date":"2025-06-06T15:31:21","date_gmt":"2025-06-06T13:31:21","guid":{"rendered":"https:\/\/prosteit.pl\/?p=7445"},"modified":"2025-10-03T10:50:12","modified_gmt":"2025-10-03T08:50:12","slug":"pst-and-ost-files-in-outlook-how-to-enlarge-them","status":"publish","type":"post","link":"https:\/\/prosteit.pl\/en\/pst-and-ost-files-in-outlook-how-to-enlarge-them\/","title":{"rendered":"How to increase the size of PST and OST files?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7445\" class=\"elementor elementor-7445\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section data-particle_enable=\"false\" data-particle-mobile-disabled=\"false\" class=\"elementor-section elementor-top-section elementor-element elementor-element-754a204 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"754a204\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-181fa4f\" data-id=\"181fa4f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2fb5057d elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"2fb5057d\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"0\" data-end=\"150\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">In the program <a href=\"https:\/\/prosteit.pl\/en\/it-services\/cloud-services\/email-migration-to-microsoft-365\/\">Microsoft Outlook<\/a> Data files such as PST (Personal Storage Table) and OST (Offline Storage Table) files play a crucial role in storing emails, calendars, contacts, and other user information.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">By default, Outlook sets size limits for these files to ensure optimal performance and stability of the application.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">However, as email usage increases and large amounts of data accumulate, users may experience issues with reaching these limits, which can lead to synchronization errors, <a href=\"https:\/\/prosteit.pl\/en\/repair-and-optimization-of-the-companys-internet\/\">slowdown in action<\/a> program and even data loss.<\/span><\/p><p data-start=\"152\" data-end=\"310\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">In this article, we will provide you a detailed guide to increase PST and OST file size limits in Outlook for Windows.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">We will discuss the differences between PST and OST files, the default size limits in different versions of Outlook, and the steps necessary to modify the system registry to increase these limits.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Additionally, we will share best practices for managing large data files and answer frequently asked questions related to this topic.<\/span><\/p><p data-start=\"312\" data-end=\"390\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Whether you are an IT administrator, a small business owner, or an individual user, this guide will help you effectively manage the size of your data files in Outlook, ensuring a smooth and hassle-free user experience.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3c96570 elementor-widget elementor-widget-image\" data-id=\"3c96570\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plik-pst-co-to-obsluga-informatyczna-firm-prosteit.webp\" class=\"attachment-full size-full wp-image-7487\" alt=\"pst files what is it, converting to ost file\" srcset=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plik-pst-co-to-obsluga-informatyczna-firm-prosteit.webp 1536w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plik-pst-co-to-obsluga-informatyczna-firm-prosteit-300x200.webp 300w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plik-pst-co-to-obsluga-informatyczna-firm-prosteit-1024x683.webp 1024w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plik-pst-co-to-obsluga-informatyczna-firm-prosteit-768x512.webp 768w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plik-pst-co-to-obsluga-informatyczna-firm-prosteit-18x12.webp 18w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section data-particle_enable=\"false\" data-particle-mobile-disabled=\"false\" class=\"elementor-section elementor-top-section elementor-element elementor-element-398e064 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"398e064\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-c1a1168\" data-id=\"c1a1168\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-020273b elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"020273b\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section data-particle_enable=\"false\" data-particle-mobile-disabled=\"false\" class=\"elementor-section elementor-top-section elementor-element elementor-element-f285af3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f285af3\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6899064\" data-id=\"6899064\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2a8574e elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"2a8574e\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"zmiana-rozmiaru-pliku-pst\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #ff6500; font-size: 24px; text-align: start;\">How to Increase PST and OST File Size Limit in Outlook<\/span><\/h2><p data-start=\"79\" data-end=\"193\">Increasing the size limit of Outlook data files (PST and OST) is possible by modifying the Windows system registry. Below is <a href=\"https:\/\/support.microsoft.com\/pl-pl\/office\/tworzenie-pliku-danych-programu-outlook-pst-do-zapisywania-informacji-17a13ca2-df52-48e8-b933-4c84c2aabe7c\" target=\"_blank\" rel=\"noopener\">detailed instructions<\/a>, how to do it safely and effectively.<\/p><h3 data-start=\"195\" data-end=\"233\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Step 1: Close Outlook<\/span><\/h3><p data-start=\"235\" data-end=\"313\">Before making any changes, make sure Outlook is completely closed.<\/p><h3 data-start=\"315\" data-end=\"353\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Step 2: Open the registry editor<\/span><\/h3><ol data-start=\"355\" data-end=\"479\"><li data-start=\"355\" data-end=\"397\"><p data-start=\"358\" data-end=\"397\">Press the keys <code data-start=\"18\" data-end=\"31\">Windows + R<\/code>to open the Run dialog box.<\/p><\/li><li data-start=\"398\" data-end=\"479\"><p data-start=\"401\" data-end=\"479\">Enter <code data-start=\"6\" data-end=\"15\">regedit<\/code> and press Enter.<\/p><\/li><\/ol><h3 data-start=\"481\" data-end=\"536\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Step 3: Navigate to the appropriate registry key<\/span><\/h3><p data-start=\"538\" data-end=\"616\">In the Registry Editor, navigate to the path that corresponds to your version of Outlook:<\/p><ul data-start=\"618\" data-end=\"866\"><li data-start=\"618\" data-end=\"659\"><p data-start=\"620\" data-end=\"659\"><strong data-start=\"0\" data-end=\"16\" data-is-only-node=\"\">\u2022 Outlook 2003<\/strong>: <code data-start=\"18\" data-end=\"80\" data-is-last-node=\"\">HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\11.0\\Outlook\\PST<\/code><\/p><\/li><li data-start=\"660\" data-end=\"701\"><p data-start=\"662\" data-end=\"701\"><strong data-start=\"0\" data-end=\"16\" data-is-only-node=\"\">\u2022 Outlook 2007<\/strong>: <code data-start=\"18\" data-end=\"80\" data-is-last-node=\"\">HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\12.0\\Outlook\\PST<\/code><\/p><\/li><li data-start=\"702\" data-end=\"743\"><p data-start=\"704\" data-end=\"743\"><strong data-start=\"0\" data-end=\"16\" data-is-only-node=\"\">\u2022 Outlook 2010<\/strong>: <code data-start=\"18\" data-end=\"80\" data-is-last-node=\"\">HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\Outlook\\PST<\/code><\/p><\/li><li data-start=\"744\" data-end=\"785\"><p data-start=\"746\" data-end=\"785\"><strong data-start=\"0\" data-end=\"16\" data-is-only-node=\"\">\u2022 Outlook 2013<\/strong>: <code data-start=\"18\" data-end=\"80\" data-is-last-node=\"\">HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\15.0\\Outlook\\PST<\/code><\/p><\/li><li data-start=\"786\" data-end=\"866\"><p data-start=\"788\" data-end=\"866\"><strong data-start=\"0\" data-end=\"30\" data-is-only-node=\"\">\u2022 Outlook 2016\/2019\/2021\/365<\/strong>: <code data-start=\"32\" data-end=\"94\" data-is-last-node=\"\">HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\16.0\\Outlook\\PST<\/code><\/p><\/li><\/ul><p data-start=\"868\" data-end=\"946\"><strong data-start=\"0\" data-end=\"9\" data-is-only-node=\"\">Attention<\/strong>: If the key <code data-start=\"23\" data-end=\"28\">PST<\/code> does not exist, right click on <code data-start=\"79\" data-end=\"88\">Outlook<\/code>, choose <code data-start=\"98\" data-end=\"104\">New<\/code> &gt; <code data-start=\"107\" data-end=\"114\">Key<\/code> and name it <code data-start=\"127\" data-end=\"132\">PST<\/code>.<\/p><h3 data-start=\"948\" data-end=\"1002\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Step 4: Create or Modify Registry Values<\/span><\/h3><p data-start=\"1004\" data-end=\"1082\">In the right panel, right-click and select <code data-start=\"59\" data-end=\"65\">New<\/code> &gt; <code data-start=\"68\" data-end=\"95\">DWORD (32-bit) value<\/code>.<\/p><p data-start=\"1084\" data-end=\"1162\">Create or modify the following values:<\/p><ul data-start=\"1164\" data-end=\"1286\"><li data-start=\"1164\" data-end=\"1205\"><p data-start=\"1166\" data-end=\"1205\"><code data-start=\"0\" data-end=\"18\" data-is-only-node=\"\">\u2022 MaxLargeFileSize<\/code> \u2013 specifies the maximum file size in megabytes (MB).<\/p><\/li><li data-start=\"1206\" data-end=\"1286\"><p data-start=\"1208\" data-end=\"1286\"><code data-start=\"0\" data-end=\"19\" data-is-only-node=\"\">\u2022 WarnLargeFileSize<\/code> \u2013 specifies the size at which a warning will appear that the size is approaching the limit.<\/p><\/li><\/ul><p data-start=\"1288\" data-end=\"1366\"><strong data-start=\"0\" data-end=\"12\" data-is-only-node=\"\">Example<\/strong>: To set the limit to 100 GB:<\/p><ul data-start=\"1368\" data-end=\"1490\"><li data-start=\"1368\" data-end=\"1409\"><p data-start=\"1370\" data-end=\"1409\"><code data-start=\"0\" data-end=\"18\" data-is-only-node=\"\">\u2022 MaxLargeFileSize<\/code> = 102400<\/p><\/li><li data-start=\"1410\" data-end=\"1490\"><p data-start=\"1412\" data-end=\"1490\"><code data-start=\"0\" data-end=\"19\" data-is-only-node=\"\">\u2022 WarnLargeFileSize<\/code> = 97280<\/p><\/li><\/ul><p data-start=\"1492\" data-end=\"1570\"><strong data-start=\"0\" data-end=\"9\" data-is-only-node=\"\">Attention<\/strong>: It is recommended that the value <code data-start=\"35\" data-end=\"54\">WarnLargeFileSize<\/code> was at least 5% less than <code data-start=\"90\" data-end=\"108\">MaxLargeFileSize<\/code>to ensure that Outlook functions properly.<\/p><h3 data-start=\"1572\" data-end=\"1602\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Step 5: Apply changes<\/span><\/h3><ol data-start=\"1604\" data-end=\"1771\"><li data-start=\"1604\" data-end=\"1646\"><p data-start=\"1607\" data-end=\"1646\">Close Registry Editor.<\/p><\/li><li data-start=\"1647\" data-end=\"1689\"><p data-start=\"1650\" data-end=\"1689\">Restart your computer for the changes to take effect.<\/p><\/li><li data-start=\"1690\" data-end=\"1771\"><p data-start=\"1693\" data-end=\"1771\"><a href=\"https:\/\/support.microsoft.com\/pl-pl\/office\/otwieranie-lub-zamykanie-plik%C3%B3w-danych-programu-outlook-pst-381b776d-7511-45a0-953a-0935c79d24f2\" target=\"_blank\" rel=\"noopener\">Open the program<\/a> Outlook and check if the new limits have been taken into account.<\/p><\/li><\/ol><h3 data-start=\"1773\" data-end=\"1812\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Warnings and best practices<\/span><\/h3><ul data-start=\"1814\" data-end=\"1978\"><li data-start=\"1814\" data-end=\"1855\"><p data-start=\"1816\" data-end=\"1855\"><strong data-start=\"0\" data-end=\"26\" data-is-only-node=\"\">\u2022 Do not exceed 100 GB<\/strong>: While it is technically possible to set higher limits, doing so can lead to Outlook performance and stability issues.<\/p><\/li><li data-start=\"1856\" data-end=\"1897\"><p data-start=\"1858\" data-end=\"1897\"><strong data-start=\"0\" data-end=\"30\" data-is-only-node=\"\">\u2022 Archive data regularly<\/strong>: Large PST and OST files can be susceptible to corruption. Regular backup and archiving of data will help avoid information loss.<\/p><\/li><li data-start=\"1898\" data-end=\"1978\"><p data-start=\"1900\" data-end=\"1978\"><strong data-start=\"0\" data-end=\"28\" data-is-only-node=\"\">\u2022 Monitor file sizes<\/strong>: Regularly checking the size of your data files will allow you to detect potential problems early.<\/p><\/li><\/ul><p data-start=\"1980\" data-end=\"2058\">Following the above steps and recommendations will allow you to safely increase the size limit of PST and OST files in Outlook while ensuring <a href=\"https:\/\/prosteit.pl\/en\/outsourcing-it-for-the-company-less-costs-more-benefits\/\">stability and performance<\/a> applications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f637e9d elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"f637e9d\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"roznice-plikow-pst-ost\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #ff6500; font-size: 24px; text-align: start;\">Differences Between PST and OST Files in Outlook<\/span><\/h2>\n<p data-start=\"79\" data-end=\"193\">Microsoft Outlook stores user data locally in two main file types: PST (Personal Storage Table) and OST (Offline Storage Table). Understanding the differences between them is crucial for <a href=\"https:\/\/prosteit.pl\/en\/how-to-speed-up-your-companys-internet-and-optimize-your-network\/\">effective management<\/a> mailbox, especially in the context of increasing the size limits of these files.<\/p>\n<h3 data-start=\"195\" data-end=\"235\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">PST (Personal Storage Table) file<\/span><\/h3>\n<p data-start=\"237\" data-end=\"254\"><strong data-start=\"237\" data-end=\"254\">Application:<\/strong><\/p>\n<ul data-start=\"256\" data-end=\"378\">\n<li data-start=\"256\" data-end=\"297\">\n<p data-start=\"258\" data-end=\"297\">\u2022 Used to store data from POP3, IMAP and webmail accounts.<\/p>\n<\/li>\n<li data-start=\"298\" data-end=\"378\">\n<p data-start=\"300\" data-end=\"378\">\u2022 Used to archive, back up, and transfer data between different Outlook installations.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"380\" data-end=\"400\"><strong data-start=\"380\" data-end=\"400\">Characteristic:<\/strong><\/p>\n<ul data-start=\"402\" data-end=\"566\">\n<li data-start=\"402\" data-end=\"443\">\n<p data-start=\"404\" data-end=\"443\">\u2022 Data is stored locally on the user&#039;s computer.<\/p>\n<\/li>\n<li data-start=\"444\" data-end=\"485\">\n<p data-start=\"446\" data-end=\"485\">\u2022 PST files can be easily transferred and imported on other devices.<\/p>\n<\/li>\n<li data-start=\"486\" data-end=\"566\">\n<p data-start=\"488\" data-end=\"566\">\u2022 The maximum default PST file size in newer versions of Outlook is 50 GB, with the option to increase it to 100 GB by editing the system registry.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"568\" data-end=\"607\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">OST (Offline Storage Table) file<\/span><\/h3>\n<p data-start=\"609\" data-end=\"626\"><strong data-start=\"609\" data-end=\"626\">Application:<\/strong><\/p>\n<ul data-start=\"628\" data-end=\"750\">\n<li data-start=\"628\" data-end=\"669\">\n<p data-start=\"630\" data-end=\"669\">\u2022 Created automatically when you set up Exchange, Microsoft 365, or Outlook.com accounts in cached mode.<\/p>\n<\/li>\n<li data-start=\"670\" data-end=\"750\">\n<p data-start=\"672\" data-end=\"750\">\u2022 Allows you to work offline; changes are synchronized with the server when you reconnect to the network.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"752\" data-end=\"772\"><strong data-start=\"752\" data-end=\"772\">Characteristic:<\/strong><\/p>\n<ul data-start=\"774\" data-end=\"938\">\n<li data-start=\"774\" data-end=\"815\">\n<p data-start=\"776\" data-end=\"815\">\u2022 Data is stored locally but is a copy of the data from the server.<\/p>\n<\/li>\n<li data-start=\"816\" data-end=\"857\">\n<p data-start=\"818\" data-end=\"857\">\u2022 OST files are specific to a given Outlook profile and cannot be easily transferred between different installations.<\/p>\n<\/li>\n<li data-start=\"858\" data-end=\"938\">\n<p data-start=\"860\" data-end=\"938\">\u2022 The default OST file size limit in newer versions of Outlook is 50 GB, with the option to increase it by editing the registry.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"940\" data-end=\"967\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Comparison of PST and OST<\/span><\/h3>\n<div>\n<div tabindex=\"-1\">\n<table data-start=\"969\" data-end=\"2294\">\n<thead data-start=\"969\" data-end=\"1095\">\n<tr data-start=\"969\" data-end=\"1095\">\n<th data-start=\"969\" data-end=\"998\" data-col-size=\"sm\">Characteristic<\/th>\n<th data-start=\"998\" data-end=\"1046\" data-col-size=\"sm\">PST<\/th>\n<th data-start=\"1046\" data-end=\"1095\" data-col-size=\"sm\">OST<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"1223\" data-end=\"2294\">\n<tr data-start=\"1223\" data-end=\"1398\">\n<td data-start=\"1223\" data-end=\"1278\" data-col-size=\"sm\"><strong data-start=\"0\" data-end=\"13\" data-is-last-node=\"\" data-is-only-node=\"\">Account Type<\/strong><\/td>\n<td data-col-size=\"sm\" data-start=\"1278\" data-end=\"1346\">POP3, IMAP, webmail<\/td>\n<td data-col-size=\"sm\" data-start=\"1346\" data-end=\"1398\">Exchange, Microsoft 365, Outlook.com<\/td>\n<\/tr>\n<tr data-start=\"1399\" data-end=\"1609\">\n<td data-start=\"1399\" data-end=\"1450\" data-col-size=\"sm\"><strong data-start=\"0\" data-end=\"17\" data-is-last-node=\"\" data-is-only-node=\"\">Offline work<\/strong><\/td>\n<td data-col-size=\"sm\" data-start=\"1450\" data-end=\"1526\">Limited<\/td>\n<td data-col-size=\"sm\" data-start=\"1526\" data-end=\"1609\">Full<\/td>\n<\/tr>\n<tr data-start=\"1610\" data-end=\"1798\">\n<td data-start=\"1610\" data-end=\"1652\" data-col-size=\"sm\"><strong data-start=\"0\" data-end=\"29\" data-is-last-node=\"\" data-is-only-node=\"\">Server synchronization<\/strong><\/td>\n<td data-col-size=\"sm\" data-start=\"1652\" data-end=\"1722\">Manual or none<\/td>\n<td data-col-size=\"sm\" data-start=\"1722\" data-end=\"1798\">Automatic<\/td>\n<\/tr>\n<tr data-start=\"1799\" data-end=\"1956\">\n<td data-start=\"1799\" data-end=\"1852\" data-col-size=\"sm\"><strong data-start=\"0\" data-end=\"15\" data-is-last-node=\"\" data-is-only-node=\"\">Portability<\/strong><\/td>\n<td data-col-size=\"sm\" data-start=\"1852\" data-end=\"1907\">Easy to transfer and import<\/td>\n<td data-col-size=\"sm\" data-start=\"1907\" data-end=\"1956\">Related to a specific Outlook profile<\/td>\n<\/tr>\n<tr data-start=\"1957\" data-end=\"2099\">\n<td data-start=\"1957\" data-end=\"2009\" data-col-size=\"sm\"><strong data-start=\"0\" data-end=\"16\" data-is-last-node=\"\" data-is-only-node=\"\">Application<\/strong><\/td>\n<td data-col-size=\"sm\" data-start=\"2009\" data-end=\"2051\">Archiving, backups, data migration<\/td>\n<td data-col-size=\"sm\" data-start=\"2051\" data-end=\"2099\">Offline work, server synchronization<\/td>\n<\/tr>\n<tr data-start=\"2100\" data-end=\"2294\">\n<td data-start=\"2100\" data-end=\"2142\" data-col-size=\"sm\"><strong data-start=\"0\" data-end=\"31\" data-is-last-node=\"\" data-is-only-node=\"\">Maximum default size<\/strong><\/td>\n<td data-col-size=\"sm\" data-start=\"2142\" data-end=\"2196\">50 GB (can be expanded)<\/td>\n<td data-col-size=\"sm\" data-start=\"2196\" data-end=\"2254\">50 GB (can be expanded)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div>\n<div>&nbsp;<span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Useful tips<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<ul data-start=\"2354\" data-end=\"2518\">\n<li data-start=\"2354\" data-end=\"2395\">\n<p data-start=\"2356\" data-end=\"2395\">\u2022 <a href=\"https:\/\/prosteit.pl\/en\/it-services\/it-administration\/it-infrastructure-maintenance\/\">Monitor regularly<\/a> size of data files to avoid performance issues.<\/p>\n<\/li>\n<li data-start=\"2396\" data-end=\"2437\">\n<p data-start=\"2398\" data-end=\"2437\">\u2022 For PST files, consider archiving them or splitting them into smaller pieces for easier management.<\/p>\n<\/li>\n<li data-start=\"2438\" data-end=\"2518\">\n<p data-start=\"2440\" data-end=\"2518\">\u2022 For OST files, remember that they are a copy of the data from the server; if there are problems, you can delete them and let Outlook re-create them.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2520\" data-end=\"2598\">Understanding the differences between files <a href=\"https:\/\/support.microsoft.com\/pl-pl\/office\/om%C3%B3wienie-plik%C3%B3w-danych-programu-outlook-pst-i-ost-222eaf92-a995-45d9-bde2-f331f60e2790\" target=\"_blank\" rel=\"noopener\">PST and OST<\/a> and their proper management is crucial to keeping Outlook running smoothly, especially in data-intensive environments.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f8db627 elementor-widget elementor-widget-image\" data-id=\"f8db627\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1920\" height=\"1281\" src=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plikipst-i-ost-konwertowanie-plikow.jpg\" class=\"attachment-full size-full wp-image-7451\" alt=\"IT specialist Warsaw help with outlook, pst and ost files\" srcset=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plikipst-i-ost-konwertowanie-plikow.jpg 1920w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plikipst-i-ost-konwertowanie-plikow-300x200.jpg 300w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plikipst-i-ost-konwertowanie-plikow-1024x683.jpg 1024w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plikipst-i-ost-konwertowanie-plikow-768x512.jpg 768w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plikipst-i-ost-konwertowanie-plikow-1536x1025.jpg 1536w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/plikipst-i-ost-konwertowanie-plikow-18x12.jpg 18w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section data-particle_enable=\"false\" data-particle-mobile-disabled=\"false\" class=\"elementor-section elementor-top-section elementor-element elementor-element-993d926 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"993d926\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-324a789\" data-id=\"324a789\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-aa1ee36 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"aa1ee36\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"domyslne-rozmiary-ost-pst\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #ff6500; font-size: 24px; text-align: start;\">Default PST and OST file size limits in different Outlook versions<\/span><\/h2><p data-start=\"79\" data-end=\"193\">Understanding the default size limits for data files in Outlook is essential for effectively managing your mailbox and avoiding data storage problems. These limits vary depending on your Outlook version and file format (ANSI or Unicode).<\/p><h3 data-start=\"195\" data-end=\"243\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Default PST and OST file size limits<\/span><\/h3><div><div tabindex=\"-1\"><table data-start=\"245\" data-end=\"1099\"><thead data-start=\"245\" data-end=\"357\"><tr data-start=\"245\" data-end=\"357\"><th data-start=\"245\" data-end=\"263\" data-col-size=\"sm\">Outlook version<\/th><th data-start=\"263\" data-end=\"278\" data-col-size=\"sm\">File format<\/th><th data-start=\"278\" data-end=\"304\" data-col-size=\"sm\">Default size limit<\/th><th data-start=\"304\" data-end=\"357\" data-col-size=\"md\">Maximum recommended limit after registry modification<\/th><\/tr><\/thead><tbody data-start=\"470\" data-end=\"1099\"><tr data-start=\"470\" data-end=\"609\"><td data-start=\"470\" data-end=\"512\" data-col-size=\"sm\">Outlook 2002 and earlier<\/td><td data-start=\"512\" data-end=\"527\" data-col-size=\"sm\">ANSI<\/td><td data-start=\"527\" data-end=\"553\" data-col-size=\"sm\">2GB<\/td><td data-start=\"553\" data-end=\"609\" data-col-size=\"md\">2 GB (no increase possible)<\/td><\/tr><tr data-start=\"610\" data-end=\"850\"><td data-start=\"610\" data-end=\"657\" data-col-size=\"sm\">Outlook 2003\u20132007<\/td><td data-start=\"657\" data-end=\"704\" data-col-size=\"sm\">Unicode<\/td><td data-start=\"704\" data-end=\"764\" data-col-size=\"sm\">20GB<\/td><td data-start=\"764\" data-end=\"850\" data-col-size=\"md\">50GB<\/td><\/tr><tr data-start=\"851\" data-end=\"1099\"><td data-start=\"851\" data-end=\"893\" data-col-size=\"sm\">Outlook 2010\u20132024, Microsoft 365<\/td><td data-start=\"893\" data-end=\"935\" data-col-size=\"sm\">Unicode<\/td><td data-start=\"935\" data-end=\"977\" data-col-size=\"sm\">50GB<\/td><td data-start=\"977\" data-end=\"1059\" data-col-size=\"md\">100GB<\/td><\/tr><\/tbody><\/table><div><div>\u00a0<\/div><\/div><\/div><\/div><p data-start=\"1101\" data-end=\"1179\"><strong data-start=\"0\" data-end=\"9\" data-is-only-node=\"\">Attention<\/strong>: ANSI files are limited to 2 GB and do not support Unicode characters, which can lead to encoding and compatibility issues. Therefore, it is recommended to use Unicode format in newer versions of Outlook.<\/p><h3 data-start=\"1181\" data-end=\"1242\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Possibility to increase limits by editing the registry<\/span><\/h3><p data-start=\"1244\" data-end=\"1362\">For Outlook 2010 and later versions, it is possible to increase the size limits of PST and OST files by modifying the system registry. These values can be set to 100 GB, but it is important to remember that too large files can negatively affect the program&#039;s performance.<\/p><p data-start=\"1364\" data-end=\"1442\"><strong data-start=\"0\" data-end=\"65\" data-is-only-node=\"\">Example registry values for Outlook 2016\/2019\/2021\/365<\/strong>:<\/p><ul data-start=\"1444\" data-end=\"1566\"><li data-start=\"1444\" data-end=\"1485\"><p data-start=\"1446\" data-end=\"1485\"><code data-start=\"0\" data-end=\"18\" data-is-only-node=\"\">\u2022 MaxLargeFileSize<\/code>: 102400 (equivalent to 100 GB)<\/p><\/li><li data-start=\"1486\" data-end=\"1566\"><p data-start=\"1488\" data-end=\"1566\"><code data-start=\"0\" data-end=\"19\" data-is-only-node=\"\">\u2022 WarnLargeFileSize<\/code>: 97280 (equivalent to 95 GB)<\/p><\/li><\/ul><p data-start=\"1568\" data-end=\"1646\"><strong data-start=\"0\" data-end=\"9\" data-is-only-node=\"\">Attention<\/strong>: It is recommended that the value <code data-start=\"35\" data-end=\"54\">WarnLargeFileSize<\/code> was set to at least 5% less than <code data-start=\"98\" data-end=\"116\">MaxLargeFileSize<\/code>to enable internal Outlook processes such as indexing and synchronization.<\/p><h3 data-start=\"1648\" data-end=\"1708\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Potential Problems with Large Data Files<\/span><\/h3><p data-start=\"1710\" data-end=\"1788\">Too large PST or OST files can lead to:<\/p><ul data-start=\"1790\" data-end=\"1954\"><li data-start=\"1790\" data-end=\"1831\"><p data-start=\"1792\" data-end=\"1831\">\u2022 Outlook slows down<\/p><\/li><li data-start=\"1832\" data-end=\"1873\"><p data-start=\"1834\" data-end=\"1873\">\u2022 Server synchronization errors<\/p><\/li><li data-start=\"1874\" data-end=\"1954\"><p data-start=\"1876\" data-end=\"1954\">\u2022 Problems with creation <a href=\"https:\/\/prosteit.pl\/en\/it-services\/back-up\/testing-backups-and-data-recovery\/\">backups<\/a> and archiving<\/p><\/li><\/ul><p data-start=\"1956\" data-end=\"2034\">Therefore, even if it is possible to increase the limits, it is recommended to regularly archive data and monitor the size of data files.<\/p><p data-start=\"2036\" data-end=\"2114\">In the following chapters, we will discuss in detail how to safely increase the size limits of PST and OST files by editing the registry and present best practices for managing large data files in Outlook.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8a616f3 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"8a616f3\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"rejestr-systemowy\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #ff6500; font-size: 24px; text-align: start;\">Preparing to edit the system registry<\/span><\/h2><p data-start=\"79\" data-end=\"233\">Increasing the size limit of PST and OST files in Outlook requires modifying the Windows system registry. This is a technical operation that, if performed incorrectly, can lead to serious problems with the operating system. Therefore, before starting any changes, you should carefully prepare for this process.<\/p><h3 data-start=\"235\" data-end=\"279\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Warning about editing the registry<\/span><\/h3><p data-start=\"281\" data-end=\"439\">The Windows registry is a central database that stores settings and options for the operating system and installed applications. Incorrect changes to the registry can lead to system instability, application errors, or even prevent the system from starting. Therefore, it is recommended that registry editing be performed by people with the appropriate technical knowledge.<\/p><h3 data-start=\"441\" data-end=\"483\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Creating a backup<\/span><\/h3><p data-start=\"485\" data-end=\"603\">Before making any changes to the registry, you should back it up. This will allow you to restore it to a previous state in case of problems;<\/p><ol data-start=\"649\" data-end=\"859\"><li data-start=\"649\" data-end=\"691\"><p data-start=\"652\" data-end=\"691\">Press the keys <code data-start=\"18\" data-end=\"31\">Windows + R<\/code>, enter <code data-start=\"39\" data-end=\"48\">regedit<\/code> and press Enter to open the Registry Editor.<\/p><\/li><li data-start=\"692\" data-end=\"734\"><p data-start=\"695\" data-end=\"734\">In the menu, select <code data-start=\"15\" data-end=\"21\">File<\/code> &gt; <code data-start=\"24\" data-end=\"35\">Export<\/code>.<\/p><\/li><li data-start=\"735\" data-end=\"777\"><p data-start=\"738\" data-end=\"777\">In the section <code data-start=\"9\" data-end=\"26\">Export Scope<\/code> choose <code data-start=\"35\" data-end=\"49\">The entire register<\/code>.<\/p><\/li><li data-start=\"778\" data-end=\"859\"><p data-start=\"781\" data-end=\"859\">Select a location to save the backup file, give it a name (e.g. <code data-start=\"76\" data-end=\"97\">backup_registry.reg<\/code>) and click <code data-start=\"109\" data-end=\"117\">Save<\/code>.<\/p><\/li><\/ol><p data-start=\"861\" data-end=\"939\">To restore the registry from a backup, simply double-click on the saved file <code data-start=\"85\" data-end=\"91\">.reg<\/code> and confirm your willingness to make changes.<\/p><h3 data-start=\"941\" data-end=\"989\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Preparing the system for editing the registry<\/span><\/h3><p data-start=\"991\" data-end=\"1036\">Before modifying the registry:<\/p><ul data-start=\"1038\" data-end=\"1202\"><li data-start=\"1038\" data-end=\"1079\"><p data-start=\"1040\" data-end=\"1079\"><strong data-start=\"0\" data-end=\"27\" data-is-only-node=\"\">\u2022 Close Outlook<\/strong>: Make sure Outlook is not running.<\/p><\/li><li data-start=\"1080\" data-end=\"1121\"><p data-start=\"1082\" data-end=\"1121\"><strong data-start=\"0\" data-end=\"26\" data-is-only-node=\"\">\u2022 Close other applications<\/strong>: To avoid conflicts, close all other programs.<\/p><\/li><li data-start=\"1122\" data-end=\"1202\"><p data-start=\"1124\" data-end=\"1202\"><strong data-start=\"0\" data-end=\"51\" data-is-only-node=\"\">\u2022 Make sure you have administrator privileges<\/strong>: Administrative privileges are required to edit the registry.<span data-state=\"closed\"><a href=\"https:\/\/learn.microsoft.com\/en-us\/answers\/questions\/769270\/the-file-size-limits-of-pst-and-ost-in-outlook-off?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\">learn.microsoft.com<\/a><\/span><\/p><\/li><\/ul><p data-start=\"1226\" data-end=\"1344\">Once you have completed the above steps, you are ready to safely edit the registry to increase the size limit of PST and OST files in Outlook. In the following sections, we will provide a detailed step-by-step guide on how to make these changes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-40711bb elementor-widget elementor-widget-image\" data-id=\"40711bb\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1920\" height=\"1277\" src=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/backup-danych-usluga-prosteit.jpg\" class=\"attachment-full size-full wp-image-7452\" alt=\"\" srcset=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/backup-danych-usluga-prosteit.jpg 1920w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/backup-danych-usluga-prosteit-300x200.jpg 300w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/backup-danych-usluga-prosteit-1024x681.jpg 1024w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/backup-danych-usluga-prosteit-768x511.jpg 768w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/backup-danych-usluga-prosteit-1536x1022.jpg 1536w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/backup-danych-usluga-prosteit-18x12.jpg 18w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f4ffc69 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"f4ffc69\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"jak-zwiekszyc-plik-pst-ost\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #ff6500; font-size: 24px; text-align: start;\">Potential Issues and Their Solutions After Increasing PST\/OST File Limit<\/span><\/h2><p data-start=\"79\" data-end=\"233\">Increasing the size limit of data files in Outlook can solve the problem of inbox overflow, but it also carries the risk of new complications. Large PST and OST files can affect the application&#039;s performance, cause synchronization errors, and even lead to data corruption. Below are the most common problems and best practices for solving them.<\/p><h3 data-start=\"240\" data-end=\"278\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Outlook slows down<\/span><\/h3><p data-start=\"280\" data-end=\"291\"><strong data-start=\"280\" data-end=\"291\">Symptoms:<\/strong><\/p><ul data-start=\"293\" data-end=\"457\"><li data-start=\"293\" data-end=\"334\"><p data-start=\"295\" data-end=\"334\">\u2022 Slow program startup.<\/p><\/li><li data-start=\"335\" data-end=\"376\"><p data-start=\"337\" data-end=\"376\">\u2022 Stuttering when viewing messages.<\/p><\/li><li data-start=\"377\" data-end=\"457\"><p data-start=\"379\" data-end=\"457\">\u2022 Delays in sending and receiving emails.<\/p><\/li><\/ul><p data-start=\"459\" data-end=\"473\"><strong data-start=\"459\" data-end=\"473\">Reasons:<\/strong><\/p><ul data-start=\"475\" data-end=\"595\"><li data-start=\"475\" data-end=\"595\"><p data-start=\"477\" data-end=\"595\">\u2022 OST\/PST files larger than 10 GB may cause brief application hangs, especially on older hardware or slower hard drives.<\/p><\/li><\/ul><p data-start=\"597\" data-end=\"613\"><strong data-start=\"597\" data-end=\"613\">Solutions:<\/strong><\/p><ul data-start=\"615\" data-end=\"779\"><li data-start=\"615\" data-end=\"656\"><p data-start=\"617\" data-end=\"656\">\u2022 Regular archiving of older messages.<\/p><\/li><li data-start=\"657\" data-end=\"698\"><p data-start=\"659\" data-end=\"698\">\u2022 Compact data files to reclaim unused space.<\/p><\/li><li data-start=\"699\" data-end=\"779\"><p data-start=\"701\" data-end=\"779\">\u2022 Moving large attachments outside of Outlook, such as to OneDrive or SharePoint.<\/p><\/li><\/ul><h3 data-start=\"786\" data-end=\"836\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Sync Errors and Folder Issues<\/span><\/h3><p data-start=\"838\" data-end=\"849\"><strong data-start=\"838\" data-end=\"849\">Symptoms:<\/strong><\/p><ul data-start=\"851\" data-end=\"1015\"><li data-start=\"851\" data-end=\"892\"><p data-start=\"853\" data-end=\"892\">\u2022 No folder updates.<\/p><\/li><li data-start=\"893\" data-end=\"934\"><p data-start=\"895\" data-end=\"934\">\u2022 Exchange Server synchronization errors.<\/p><\/li><li data-start=\"935\" data-end=\"1015\"><p data-start=\"937\" data-end=\"1015\">\u2022 Issues with calendar or shared folders.<\/p><\/li><\/ul><p data-start=\"1017\" data-end=\"1031\"><strong data-start=\"1017\" data-end=\"1031\">Reasons:<\/strong><\/p><ul data-start=\"1033\" data-end=\"1153\"><li data-start=\"1033\" data-end=\"1153\"><p data-start=\"1035\" data-end=\"1153\">\u2022 Too many items in folders (over 100,000) or too many folders (over 10,000) can lead to performance and synchronization issues.<\/p><\/li><\/ul><p data-start=\"1155\" data-end=\"1171\"><strong data-start=\"1155\" data-end=\"1171\">Solutions:<\/strong><\/p><ul data-start=\"1173\" data-end=\"1337\"><li data-start=\"1173\" data-end=\"1214\"><p data-start=\"1175\" data-end=\"1214\">\u2022 Limit the number of items synced by setting a shorter sync period (e.g. 6 months instead of \u201cAll\u201d).<\/p><\/li><li data-start=\"1215\" data-end=\"1256\"><p data-start=\"1217\" data-end=\"1256\">\u2022 Disable shared folder syncing unless necessary.<\/p><\/li><li data-start=\"1257\" data-end=\"1337\"><p data-start=\"1259\" data-end=\"1337\">\u2022 Moving older items to an online archive or local PST file.<\/p><\/li><\/ul><h3 data-start=\"1344\" data-end=\"1381\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Compacting PST and OST files<\/span><\/h3><p data-start=\"1383\" data-end=\"1402\"><strong data-start=\"1383\" data-end=\"1402\">Why it&#039;s worth it:<\/strong><\/p><p data-start=\"1404\" data-end=\"1482\">When you delete items from Outlook, the data files do not automatically shrink. Compacting allows you to reclaim unused space and improve the program&#039;s performance.<\/p><p data-start=\"1484\" data-end=\"1502\"><strong data-start=\"1484\" data-end=\"1502\">How to do it:<\/strong><\/p><ol data-start=\"1504\" data-end=\"1671\"><li data-start=\"1504\" data-end=\"1546\"><p data-start=\"1507\" data-end=\"1546\">In Outlook go to <code data-start=\"22\" data-end=\"28\">File<\/code> &gt; <code data-start=\"31\" data-end=\"48\">Account settings<\/code> &gt; <code data-start=\"51\" data-end=\"68\">Account settings<\/code>.<\/p><\/li><li data-start=\"1547\" data-end=\"1589\"><p data-start=\"1550\" data-end=\"1589\">On the card <code data-start=\"10\" data-end=\"24\">Data files<\/code> select the appropriate PST or OST file and click <code data-start=\"71\" data-end=\"83\">Settings<\/code>.<\/p><\/li><li data-start=\"1590\" data-end=\"1671\"><p data-start=\"1593\" data-end=\"1671\">Choose <code data-start=\"8\" data-end=\"25\">Compact now<\/code> and confirm.<\/p><\/li><\/ol><p data-start=\"1673\" data-end=\"1751\"><strong data-start=\"0\" data-end=\"10\" data-is-only-node=\"\">Attention:<\/strong> The process may take several minutes depending on the file size.<\/p><h3 data-start=\"1758\" data-end=\"1799\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Data archiving and management<\/span><\/h3><p data-start=\"1801\" data-end=\"1824\"><strong data-start=\"1801\" data-end=\"1824\">Best practices:<\/strong><\/p><ul data-start=\"1826\" data-end=\"1990\"><li data-start=\"1826\" data-end=\"1867\"><p data-start=\"1828\" data-end=\"1867\">\u2022 Use the AutoArchive feature to automatically move older messages to separate PST files.<\/p><\/li><li data-start=\"1868\" data-end=\"1909\"><p data-start=\"1870\" data-end=\"1909\">\u2022 Creating manual archives for specific projects or time periods.<\/p><\/li><li data-start=\"1910\" data-end=\"1990\"><p data-start=\"1912\" data-end=\"1990\">\u2022 Regularly review and delete unnecessary messages and attachments.<\/p><\/li><\/ul><p data-start=\"1992\" data-end=\"2005\"><strong data-start=\"1992\" data-end=\"2005\">Benefits:<\/strong><\/p><ul data-start=\"2007\" data-end=\"2173\"><li data-start=\"2007\" data-end=\"2048\"><p data-start=\"2009\" data-end=\"2048\">\u2022 Reducing the size of main data files.<\/p><\/li><li data-start=\"2049\" data-end=\"2090\"><p data-start=\"2051\" data-end=\"2090\">\u2022 Improved Outlook performance.<\/p><\/li><li data-start=\"2091\" data-end=\"2173\"><p data-start=\"2093\" data-end=\"2173\">\u2022 Manage and find important information more easily.<\/p><\/li><\/ul><h3 data-start=\"2180\" data-end=\"2206\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Additional tips<\/span><\/h3><ul data-start=\"2208\" data-end=\"2380\"><li data-start=\"2208\" data-end=\"2251\"><p data-start=\"2210\" data-end=\"2251\">\u2022 Avoid exceeding 50 GB for OST and PST files, even if you increase the limit in the registry. Overly large files can lead to performance and stability issues with the program.<\/p><\/li><li data-start=\"2252\" data-end=\"2295\"><p data-start=\"2254\" data-end=\"2295\">\u2022 Regularly monitor the size of data files and implement appropriate preventive measures.<\/p><\/li><li data-start=\"2296\" data-end=\"2380\"><p data-start=\"2298\" data-end=\"2380\">\u2022 Use tools such as <code data-start=\"32\" data-end=\"45\">scanpst.exe<\/code> to repair corrupted PST files.<\/p><\/li><\/ul><p data-start=\"2382\" data-end=\"2464\">Remember that proper management of data files in Outlook is not only <a href=\"https:\/\/prosteit.pl\/en\/how-to-protect-your-mailbox-from-phishing\/\">prevents problems<\/a>, but also ensures smooth and efficient use of the program.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-476ee30 elementor-widget elementor-widget-image\" data-id=\"476ee30\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1280\" src=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/konwertowanie-plikow-pst-na-ost-grafika-prosteit.jpg\" class=\"attachment-full size-full wp-image-7453\" alt=\"\" srcset=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/konwertowanie-plikow-pst-na-ost-grafika-prosteit.jpg 1920w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/konwertowanie-plikow-pst-na-ost-grafika-prosteit-300x200.jpg 300w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/konwertowanie-plikow-pst-na-ost-grafika-prosteit-1024x683.jpg 1024w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/konwertowanie-plikow-pst-na-ost-grafika-prosteit-768x512.jpg 768w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/konwertowanie-plikow-pst-na-ost-grafika-prosteit-1536x1024.jpg 1536w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/konwertowanie-plikow-pst-na-ost-grafika-prosteit-18x12.jpg 18w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c9a03ef elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"c9a03ef\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"duzy-plik-pst-ost\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #ff6500; font-size: 24px; text-align: start;\">Best Practices for Managing Large PST and OST Files<\/span><\/h2><p data-start=\"79\" data-end=\"193\"><a href=\"https:\/\/prosteit.pl\/en\/it-services\/it-administration\/windows-server-administration\/\">Effective management<\/a> The size of Outlook data files, such as PST and OST, is crucial to ensuring the application runs smoothly and avoiding performance and synchronization issues. Below are proven methods and tools to help keep your data files in optimal condition.<\/p><h3 data-start=\"200\" data-end=\"248\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Regularly clean your inbox<\/span><\/h3><p data-start=\"250\" data-end=\"272\"><strong data-start=\"250\" data-end=\"272\">Why it&#039;s important:<\/strong><\/p><p data-start=\"274\" data-end=\"352\">Over time, your inbox can accumulate a large volume of messages, which leads to the increase in the size of your PST and OST files. Regularly deleting unnecessary messages and attachments helps keep your data files at a manageable level.<\/p><p data-start=\"354\" data-end=\"372\"><strong data-start=\"354\" data-end=\"372\">How to do it:<\/strong><\/p><ol data-start=\"374\" data-end=\"718\"><li data-start=\"374\" data-end=\"590\"><p data-start=\"377\" data-end=\"416\">Use the tool <strong data-start=\"15\" data-end=\"39\">Cleaning the box<\/strong>:<\/p><ul data-start=\"420\" data-end=\"590\"><li data-start=\"420\" data-end=\"461\"><p data-start=\"422\" data-end=\"461\">\u2022 In Outlook, go to <code data-start=\"22\" data-end=\"28\">File<\/code> &gt; <code data-start=\"31\" data-end=\"42\">Tools<\/code> &gt; <code data-start=\"45\" data-end=\"67\">Cleaning the box<\/code>.<\/p><\/li><li data-start=\"465\" data-end=\"506\"><p data-start=\"467\" data-end=\"506\">\u2022 Check the size of the mailbox and individual folders.<\/p><\/li><li data-start=\"510\" data-end=\"590\"><p data-start=\"512\" data-end=\"590\">\u2022 Find and delete messages older than a specific period or larger than a specific size.<\/p><\/li><\/ul><\/li><li data-start=\"592\" data-end=\"718\"><p data-start=\"595\" data-end=\"634\">Remove items from folder <strong data-start=\"24\" data-end=\"45\">Removed items<\/strong>:<\/p><ul data-start=\"638\" data-end=\"718\"><li data-start=\"638\" data-end=\"718\"><p data-start=\"640\" data-end=\"718\">\u2022 Right click on the folder <code data-start=\"43\" data-end=\"62\">Removed items<\/code> and choose <code data-start=\"73\" data-end=\"90\">Empty folder<\/code>.<\/p><\/li><\/ul><\/li><\/ol><h3 data-start=\"725\" data-end=\"752\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Data archiving<\/span><\/h3><p data-start=\"754\" data-end=\"776\"><strong data-start=\"754\" data-end=\"776\">Why it&#039;s important:<\/strong><\/p><p data-start=\"778\" data-end=\"856\"><a href=\"https:\/\/prosteit.pl\/en\/backup-and-recovery-solutions\/\">Moving older messages<\/a> to separate PST archive files allows you to reduce the size of the main data files and improve Outlook performance.<\/p><p data-start=\"858\" data-end=\"876\"><strong data-start=\"858\" data-end=\"876\">How to do it:<\/strong><\/p><ol data-start=\"878\" data-end=\"1222\"><li data-start=\"878\" data-end=\"1049\"><p data-start=\"881\" data-end=\"920\">Configure <strong data-start=\"12\" data-end=\"32\">Self-archiving<\/strong>:<\/p><ul data-start=\"924\" data-end=\"1049\"><li data-start=\"924\" data-end=\"965\"><p data-start=\"926\" data-end=\"965\">\u2022 In Outlook, go to <code data-start=\"22\" data-end=\"28\">File<\/code> &gt; <code data-start=\"31\" data-end=\"38\">Options<\/code> &gt; <code data-start=\"41\" data-end=\"55\">Advanced<\/code> &gt; <code data-start=\"58\" data-end=\"87\">AutoArchive Settings<\/code>.<\/p><\/li><li data-start=\"969\" data-end=\"1049\"><p data-start=\"971\" data-end=\"1049\">\u2022 Set the archiving frequency and archive file location.<\/p><\/li><\/ul><\/li><li data-start=\"1051\" data-end=\"1222\"><p data-start=\"1054\" data-end=\"1093\">Manual archiving:<\/p><ul data-start=\"1097\" data-end=\"1222\"><li data-start=\"1097\" data-end=\"1138\"><p data-start=\"1099\" data-end=\"1138\">\u2022 Go to <code data-start=\"11\" data-end=\"17\">File<\/code> &gt; <code data-start=\"20\" data-end=\"31\">Tools<\/code> &gt; <code data-start=\"34\" data-end=\"46\">Archive<\/code>.<\/p><\/li><li data-start=\"1142\" data-end=\"1222\"><p data-start=\"1144\" data-end=\"1222\">\u2022 Select the folders to archive and specify the date before which messages should be archived.<\/p><\/li><\/ul><\/li><\/ol><h3 data-start=\"1229\" data-end=\"1284\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Cached mode synchronization limitation<\/span><\/h3><p data-start=\"1286\" data-end=\"1308\"><strong data-start=\"1286\" data-end=\"1308\">Why it&#039;s important:<\/strong><\/p><p data-start=\"1310\" data-end=\"1388\">Syncing your entire mailbox in cached mode can lead to large OST files and performance issues.<\/p><p data-start=\"1390\" data-end=\"1408\"><strong data-start=\"1390\" data-end=\"1408\">How to do it:<\/strong><\/p><ol data-start=\"1410\" data-end=\"1577\"><li data-start=\"1410\" data-end=\"1452\"><p data-start=\"1413\" data-end=\"1452\">Go to <code data-start=\"11\" data-end=\"17\">File<\/code> &gt; <code data-start=\"20\" data-end=\"37\">Account settings<\/code> &gt; <code data-start=\"40\" data-end=\"57\">Account settings<\/code>.<\/p><\/li><li data-start=\"1453\" data-end=\"1495\"><p data-start=\"1456\" data-end=\"1495\">On the card <code data-start=\"10\" data-end=\"18\">E-mail<\/code> select your account and click <code data-start=\"49\" data-end=\"56\">Change<\/code>.<\/p><\/li><li data-start=\"1496\" data-end=\"1577\"><p data-start=\"1499\" data-end=\"1577\">Customize slider <code data-start=\"15\" data-end=\"55\">Cached Exchange Mode Settings<\/code>to sync only the last few months of messages (e.g. 6 months).<\/p><\/li><\/ol><h3 data-start=\"1584\" data-end=\"1618\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Compacting data files<\/span><\/h3><p data-start=\"1620\" data-end=\"1642\"><strong data-start=\"1620\" data-end=\"1642\">Why it&#039;s important:<\/strong><\/p><p data-start=\"1644\" data-end=\"1722\">When you delete messages, Outlook doesn&#039;t always automatically reduce the size of PST and OST files. Manual compaction allows you to reclaim unused space.<\/p><p data-start=\"1724\" data-end=\"1742\"><strong data-start=\"1724\" data-end=\"1742\">How to do it:<\/strong><\/p><ol data-start=\"1744\" data-end=\"1911\"><li data-start=\"1744\" data-end=\"1786\"><p data-start=\"1747\" data-end=\"1786\">Go to <code data-start=\"11\" data-end=\"17\">File<\/code> &gt; <code data-start=\"20\" data-end=\"37\">Account settings<\/code> &gt; <code data-start=\"40\" data-end=\"57\">Account settings<\/code>.<\/p><\/li><li data-start=\"1787\" data-end=\"1829\"><p data-start=\"1790\" data-end=\"1829\">On the card <code data-start=\"10\" data-end=\"24\">Data files<\/code> select the appropriate file and click <code data-start=\"59\" data-end=\"71\">Settings<\/code>.<\/p><\/li><li data-start=\"1830\" data-end=\"1911\"><p data-start=\"1833\" data-end=\"1911\">Click <code data-start=\"8\" data-end=\"25\">Compact now<\/code>.<\/p><\/li><\/ol><h3 data-start=\"1918\" data-end=\"1961\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Monitoring the size of data files<\/span><\/h3><p data-start=\"1963\" data-end=\"1985\"><strong data-start=\"1963\" data-end=\"1985\">Why it&#039;s important:<\/strong><\/p><p data-start=\"1987\" data-end=\"2065\">Regularly checking the size of PST and OST files allows you to detect problems early and take appropriate action.<\/p><p data-start=\"2067\" data-end=\"2085\"><strong data-start=\"2067\" data-end=\"2085\">How to do it:<\/strong><\/p><ol data-start=\"2087\" data-end=\"2211\"><li data-start=\"2087\" data-end=\"2129\"><p data-start=\"2090\" data-end=\"2129\">In Outlook go to <code data-start=\"22\" data-end=\"28\">File<\/code> &gt; <code data-start=\"31\" data-end=\"48\">Account settings<\/code> &gt; <code data-start=\"51\" data-end=\"68\">Account settings<\/code>.<\/p><\/li><li data-start=\"2130\" data-end=\"2211\"><p data-start=\"2133\" data-end=\"2211\">On the card <code data-start=\"10\" data-end=\"24\">Data files<\/code> check the size of individual data files.<\/p><\/li><\/ol><h3 data-start=\"2218\" data-end=\"2273\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Using Data File Repair Tools<\/span><\/h3><p data-start=\"2275\" data-end=\"2297\"><strong data-start=\"2275\" data-end=\"2297\">Why it&#039;s important:<\/strong><\/p><p data-start=\"2299\" data-end=\"2379\">In case of corruption of PST or OST files, the tool <code data-start=\"54\" data-end=\"67\">scanpst.exe<\/code> allows them to be repaired and data recovered.<\/p><p data-start=\"2381\" data-end=\"2399\"><strong data-start=\"2381\" data-end=\"2399\">How to do it:<\/strong><\/p><ol data-start=\"2401\" data-end=\"2576\"><li data-start=\"2401\" data-end=\"2445\"><p data-start=\"2404\" data-end=\"2445\">Close Outlook.<\/p><\/li><li data-start=\"2446\" data-end=\"2490\"><p data-start=\"2449\" data-end=\"2490\">Start <code data-start=\"8\" data-end=\"21\">scanpst.exe<\/code> (usually located in the Outlook installation folder).<\/p><\/li><li data-start=\"2491\" data-end=\"2576\"><p data-start=\"2494\" data-end=\"2576\">Select the PST or OST file to repair and follow the instructions.<\/p><\/li><\/ol><p data-start=\"2583\" data-end=\"2665\">Applying the above practices will allow you to effectively manage data files in Outlook, ensuring the stability and performance of the application.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-046f8b0 elementor-widget elementor-widget-image\" data-id=\"046f8b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1280\" src=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/proste-it-pomoc-informatyczna-dla-firm-backup.jpg\" class=\"attachment-full size-full wp-image-7454\" alt=\"\" srcset=\"https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/proste-it-pomoc-informatyczna-dla-firm-backup.jpg 1920w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/proste-it-pomoc-informatyczna-dla-firm-backup-300x200.jpg 300w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/proste-it-pomoc-informatyczna-dla-firm-backup-1024x683.jpg 1024w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/proste-it-pomoc-informatyczna-dla-firm-backup-768x512.jpg 768w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/proste-it-pomoc-informatyczna-dla-firm-backup-1536x1024.jpg 1536w, https:\/\/prosteit.pl\/wp-content\/uploads\/2025\/06\/proste-it-pomoc-informatyczna-dla-firm-backup-18x12.jpg 18w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eb34895 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"eb34895\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"alternatywne-metody-zarzadzania-plikami-pst-ost\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #ff6500; font-size: 24px; text-align: start;\">Alternative methods to manage large PST and OST files<\/span><\/h2><p data-start=\"79\" data-end=\"193\">Managing large Outlook data files (PST and OST) doesn&#039;t have to be limited to modifying the system registry. There are other, more flexible and scalable methods that allow you to effectively control the size of these files, minimizing the risk of performance degradation or data corruption.<\/p><h3 data-start=\"200\" data-end=\"282\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Using Group Policy to Manage File Sizes<\/span><\/h3><p data-start=\"284\" data-end=\"362\">In enterprise environments, IT administrators can use Group Policy to centrally manage Outlook settings, including PST and OST file size limits.<\/p><p data-start=\"364\" data-end=\"374\"><strong data-start=\"364\" data-end=\"374\">Steps:<\/strong><\/p><ol data-start=\"376\" data-end=\"586\"><li data-start=\"376\" data-end=\"418\"><p data-start=\"379\" data-end=\"418\">Download and install the appropriate Administrative Templates (ADMX) for the version of Office used in your organization.<\/p><\/li><li data-start=\"419\" data-end=\"461\"><p data-start=\"422\" data-end=\"461\">Open the Group Policy Management Editor.<\/p><\/li><li data-start=\"462\" data-end=\"504\"><p data-start=\"465\" data-end=\"504\">Go to: <code data-start=\"12\" data-end=\"38\">User configuration<\/code> &gt; <code data-start=\"41\" data-end=\"67\">Administrative templates<\/code> &gt; <code data-start=\"70\" data-end=\"89\">Microsoft Outlook<\/code> &gt; <code data-start=\"92\" data-end=\"118\">Data File Settings<\/code>.<\/p><\/li><li data-start=\"505\" data-end=\"586\"><p data-start=\"508\" data-end=\"586\">Configure the appropriate settings such as <code data-start=\"46\" data-end=\"76\">Maximum PST file size<\/code> Whether <code data-start=\"81\" data-end=\"135\">File size limit approaching warning<\/code>.<\/p><\/li><\/ol><p data-start=\"588\" data-end=\"666\">With this approach, changes are applied globally, which ensures consistency and facilitates management in large organizations.<\/p><h3 data-start=\"673\" data-end=\"753\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Limit data syncing with the cached mode slider<\/span><\/h3><p data-start=\"755\" data-end=\"833\">Outlook offers the ability to limit the amount of data synchronized locally by setting a synchronization time range.<\/p><p data-start=\"835\" data-end=\"853\"><strong data-start=\"835\" data-end=\"853\">How to do it:<\/strong><\/p><ol data-start=\"855\" data-end=\"1022\"><li data-start=\"855\" data-end=\"897\"><p data-start=\"858\" data-end=\"897\">In Outlook go to <code data-start=\"22\" data-end=\"28\">File<\/code> &gt; <code data-start=\"31\" data-end=\"48\">Account settings<\/code> &gt; <code data-start=\"51\" data-end=\"68\">Account settings<\/code>.<\/p><\/li><li data-start=\"898\" data-end=\"940\"><p data-start=\"901\" data-end=\"940\">Select an account and click <code data-start=\"24\" data-end=\"31\">Change<\/code>.<\/p><\/li><li data-start=\"941\" data-end=\"1022\"><p data-start=\"944\" data-end=\"1022\">Use the slider <code data-start=\"12\" data-end=\"52\">Cached Exchange Mode Settings<\/code>to specify a synchronization range (e.g. 3 months, 6 months).<\/p><\/li><\/ol><p data-start=\"1024\" data-end=\"1102\">Limiting sync to a shorter period reduces the size of the OST file, which can improve Outlook performance, especially on devices with limited storage space.<\/p><h3 data-start=\"1109\" data-end=\"1168\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Using PST File Management Tools<\/span><\/h3><p data-start=\"1170\" data-end=\"1248\">There are specialized tools that allow advanced management of PST files, such as splitting, merging, or compressing them.<\/p><p data-start=\"1250\" data-end=\"1276\"><strong data-start=\"1250\" data-end=\"1276\">Example tools:<\/strong><\/p><ul data-start=\"1278\" data-end=\"1400\"><li data-start=\"1278\" data-end=\"1319\"><p data-start=\"1280\" data-end=\"1319\"><strong data-start=\"0\" data-end=\"58\" data-is-only-node=\"\">\u2022 Inbox Repair Tool (scanpst.exe)<\/strong> \u2013 used to repair corrupted PST files.<\/p><\/li><li data-start=\"1320\" data-end=\"1400\"><p data-start=\"1322\" data-end=\"1400\"><strong data-start=\"0\" data-end=\"27\" data-is-only-node=\"\">\u2022 Third Party Tools<\/strong> \u2013 offer features such as splitting large PST files into smaller pieces, making them easier to manage and archive.<\/p><\/li><\/ul><p data-start=\"1402\" data-end=\"1480\">Regular use of these tools helps keep PST files in optimal condition, minimizing the risk of corruption.<\/p><h3 data-start=\"1487\" data-end=\"1527\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Transferring data to the cloud<\/span><\/h3><p data-start=\"1529\" data-end=\"1607\">Instead of storing large amounts of data locally, you may want to consider moving some of your data to the cloud.<\/p><p data-start=\"1609\" data-end=\"1622\"><strong data-start=\"1609\" data-end=\"1622\">Benefits:<\/strong><\/p><ul data-start=\"1624\" data-end=\"1788\"><li data-start=\"1624\" data-end=\"1665\"><p data-start=\"1626\" data-end=\"1665\">\u2022 Reduce the size of local PST and OST files.<\/p><\/li><li data-start=\"1666\" data-end=\"1707\"><p data-start=\"1668\" data-end=\"1707\">\u2022 Access to data from various devices and locations.<\/p><\/li><li data-start=\"1708\" data-end=\"1788\"><p data-start=\"1710\" data-end=\"1788\">\u2022 Increased security and data protection thanks to cloud solutions.<\/p><\/li><\/ul><p data-start=\"1790\" data-end=\"1868\">Services like Microsoft 365 offer the ability to store data in the cloud, which can make managing large data sets much easier.<\/p><h3 data-start=\"1875\" data-end=\"1931\"><span style=\"color: #ff6500; font-size: 20px; text-align: start;\">Monitoring and analyzing the size of data files<\/span><\/h3><p data-start=\"1933\" data-end=\"2011\">Regularly monitoring the size of PST and OST files allows you to detect potential problems early and take appropriate actions.<\/p><p data-start=\"2013\" data-end=\"2031\"><strong data-start=\"2013\" data-end=\"2031\">How to do it:<\/strong><\/p><ol data-start=\"2033\" data-end=\"2200\"><li data-start=\"2033\" data-end=\"2075\"><p data-start=\"2036\" data-end=\"2075\">In Outlook go to <code data-start=\"22\" data-end=\"28\">File<\/code> &gt; <code data-start=\"31\" data-end=\"42\">Tools<\/code> &gt; <code data-start=\"45\" data-end=\"67\">Cleaning the box<\/code>.<\/p><\/li><li data-start=\"2076\" data-end=\"2118\"><p data-start=\"2079\" data-end=\"2118\">Use options <code data-start=\"11\" data-end=\"38\">View box size<\/code>to see the size of individual folders.<\/p><\/li><li data-start=\"2119\" data-end=\"2200\"><p data-start=\"2122\" data-end=\"2200\">Analyze and delete unnecessary messages and attachments to reduce the size of your data files.<\/p><\/li><\/ol><p data-start=\"2202\" data-end=\"2282\">With regular monitoring, you can prevent file size limits from being exceeded and related problems from occurring.<\/p><p data-start=\"2289\" data-end=\"2413\">In conclusion, managing large PST and OST files in Outlook does not have to be limited to editing the registry. Using alternative methods such as group policies, restricting synchronization, file management tools, or moving data to the cloud allows for more flexible and effective control over the size of data files while ensuring the stability and performance of Outlook.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3400eac elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"3400eac\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"20\" data-end=\"472\">Managing the size of PST and OST files in Outlook is a key element in maintaining the performance, stability, and security of data \u2013 both for individual users and small and medium-sized businesses. By increasing the limits in the Windows registry, archiving, data compaction, and alternative methods (such as the cloud or group policies), you can effectively prevent mailbox overflow and synchronization errors.<\/p><p data-start=\"474\" data-end=\"695\">However, if you are not confident in modifying system settings, are afraid of losing data or want your email environment to run smoothly and securely - <strong data-start=\"649\" data-end=\"694\">ProsteIT team is at your disposal<\/strong>.<\/p><p data-start=\"697\" data-end=\"709\">We will help you:<\/p><ul data-start=\"710\" data-end=\"859\"><li data-start=\"710\" data-end=\"757\"><p data-start=\"712\" data-end=\"757\">\u2022increase PST and OST file limits without risk,<\/p><\/li><li data-start=\"758\" data-end=\"803\"><p data-start=\"760\" data-end=\"803\">\u2022 optimize Outlook performance in your company,<\/p><\/li><li data-start=\"804\" data-end=\"859\"><p data-start=\"806\" data-end=\"859\">\u2022 take care of backup copies and archiving automation.<\/p><\/li><\/ul><p data-start=\"861\" data-end=\"992\" data-is-last-node=\"\" data-is-only-node=\"\">Because with us IT becomes simple. <a href=\"https:\/\/prosteit.pl\/en\/contact\/\">SimpleIT<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>In Microsoft Outlook, data files like PST (Personal Storage Table) and OST (Offline Storage Table) files play a crucial role in storing emails, calendars, contacts, and other user information. By default, Outlook sets size limits for these files to ensure optimal performance and stability of the application. However, with heavy use, [\u2026]<\/p>","protected":false},"author":4,"featured_media":7455,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[433,669,658,667,663,659,449,448,225,224,451,675,665,656,664,660,674,676,657,673,661,671,672,666,662,670,226,234,439],"class_list":["post-7445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sieci","tag-bezpieczenstwo-w-firmie","tag-co-sie-stanie-jesli-usune-pik-pst","tag-co-to-jest-plik-pst","tag-co-to-sa-pliki-pst","tag-gdzie-jest-plik-pst-outlook","tag-gdzie-plik-pst","tag-informatyk-ozarow-mazowiecki","tag-informatyk-warszawa","tag-it-dla-firm","tag-it-dla-malej-firmy","tag-it-dla-malych-firm","tag-jak-dodac-plik-ost-do-outlooka","tag-jak-dodac-plik-pst-do-outlooka","tag-jak-naprawic-plik-pst","tag-jak-otworzyc-plik-pst","tag-jak-utworzyc-plik-pst","tag-jak-zaimportowac-plik-ost-do-outlooka","tag-jak-zmienic-plik-ost-do-pst","tag-obsluga-it-firm","tag-ost","tag-outlook-gdzie-plik-pst","tag-plik-ost","tag-plik-ost-jak-otworzyc","tag-plik-pst","tag-plik-pst-co-to","tag-plik-pst-jest-za-duzy","tag-pomoc-it","tag-pomoc-it-dla-firm","tag-pomoc-komputerowa"],"_links":{"self":[{"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/posts\/7445","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/comments?post=7445"}],"version-history":[{"count":16,"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/posts\/7445\/revisions"}],"predecessor-version":[{"id":10140,"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/posts\/7445\/revisions\/10140"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/media\/7455"}],"wp:attachment":[{"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/media?parent=7445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/categories?post=7445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prosteit.pl\/en\/wp-json\/wp\/v2\/tags?post=7445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}