{"id":27082,"date":"2025-06-16T14:37:12","date_gmt":"2025-06-16T08:37:12","guid":{"rendered":"https:\/\/dohaj.com\/blog\/?p=27082"},"modified":"2025-06-16T14:40:36","modified_gmt":"2025-06-16T08:40:36","slug":"outlook-2016-ost-file-size-limit-complete-guide","status":"publish","type":"post","link":"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/","title":{"rendered":"Outlook 2016 OST File Size Limit \u2013 Complete Guide"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#What_is_the_OST_file_size_limit_in_Outlook_2016\" >What is the OST file size limit in Outlook 2016?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#Difference_Between_OST_and_PST_Files\" >Difference Between OST and PST Files<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#Purpose_of_OST_in_Cached_Exchange_Mode\" >Purpose of OST in Cached Exchange Mode<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#What_is_the_Default_OST_File_Size_Limit_for_Outlook_2016\" >What is the Default OST File Size Limit for Outlook 2016?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#Default_Size_Limits_for_ANSI_vs_Unicode_OST_Files\" >Default Size Limits for ANSI vs. Unicode OST Files<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#Official_Microsoft_Limits_for_Outlook_2016\" >Official Microsoft Limits for Outlook 2016<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#When_Should_You_Consider_Converting_OST_to_PST\" >When Should You Consider Converting OST to PST?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#Risks_of_Hitting_the_OST_File_Size_Limit_in_Outlook_2016\" >Risks of Hitting the OST File Size Limit in Outlook 2016<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#How_to_Check_OST_File_Size_in_Outlook_2016\" >How to Check OST File Size in Outlook 2016<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/dohaj.com\/blog\/outlook-2016-ost-file-size-limit-complete-guide\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_OST_file_size_limit_in_Outlook_2016\"><\/span><strong>What is the OST file size limit in Outlook 2016?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>The OST (Offline Storage Table) file is a local copy of your mailbox data that Outlook 2016 creates when using an Exchange, Office 365, or IMAP account. It lets you work with email, calendar, contacts, and other Outlook data offline. Changes are automatically synchronized to the server when you reconnect. Understanding OST files is critical for mailbox performance management and ensuring you don\u2019t exceed the default OST file size limit in Outlook 2016.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Difference_Between_OST_and_PST_Files\"><\/span><br><strong>Difference Between OST and PST Files<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>Although both OST and PST files store Outlook data, they serve different purposes:<br><strong>OST file<\/strong>: Automatically created when using Exchange\/IMAP accounts. It syncs with the mail server and cannot be imported into Outlook from another profile.<br><strong>PST file<\/strong>: Created manually, usually for backups or archiving. It can be moved and imported into any Outlook profile and is ideal for reducing OST file size by offloading older data.<br>Knowing when to use PST files can help manage OST size limits in Outlook 2016.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Purpose_of_OST_in_Cached_Exchange_Mode\"><\/span><br><strong>Purpose of OST in Cached Exchange Mode<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>In Outlook 2016, Cache Exchange Mode uses an OST file to improve performance. Instead of constantly accessing the server, Outlook reads data from the OST file, providing faster access to emails and calendar events. This setup is especially helpful in low-bandwidth environments or when working remotely.<br>However, as mailbox data grows, the OST file can become large, leading to slow performance or corruption. That&#8217;s why it&#8217;s important to monitor and manage the OST file size limit in Outlook 2016 proactively.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_Default_OST_File_Size_Limit_for_Outlook_2016\"><\/span><br><strong>What is the Default OST File Size Limit for Outlook 2016?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>Microsoft Outlook 2016 supports large mailboxes but has storage limits, especially for OST files. When your OST file grows too big, it can degrade performance, cause sync issues, or get corrupted. Understanding the default size limit can help you avoid these issues and manage your mailbox more effectively.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Default_Size_Limits_for_ANSI_vs_Unicode_OST_Files\"><\/span><br><strong>Default Size Limits for ANSI vs. Unicode OST Files<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>Outlook supports two types of data file formats:<br><strong>ANSI format<\/strong> (used in older Outlook versions): Maximum size is 2 GB.<br><strong>Unicode format<\/strong> (used in Outlook 2003 and later, including 2016): Default limit is 50 GB.<br>Outlook 2016 uses Unicode format, so the default OST file size limit is 50 GB, configurable via the Windows Registry.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Official_Microsoft_Limits_for_Outlook_2016\"><\/span><br><strong>Official Microsoft Limits for Outlook 2016<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>According to Microsoft documentation:<br><strong>Default maximum size<\/strong>: 50 GB for both OST and PST files.<br><strong>Configurable limits<\/strong>: You can adjust limits via Registry:<br><strong>MaxLargeFileSize<\/strong> \u2013 absolute maximum size (MB)<br><strong>WarnLargeFileSize<\/strong> \u2013 warning threshold (MB), usually around 47.5 GB<br>Keeping your OST file below the warning threshold optimizes performance and Outlook stability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"When_Should_You_Consider_Converting_OST_to_PST\"><\/span><br><strong>When Should You Consider Converting OST to PST?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>While OST files are great for offline access in Outlook 2016, they\u2019re not ideal for backup, recovery, or migration. <a href=\"https:\/\/www.bitrecover.com\/ost\/converter\/\">OST Converter<\/a>\u00a0 may be necessary in these scenarios:<br><strong>Orphaned OST file<\/strong>: If your Outlook profile is deleted, corrupted, or the Exchange server is unavailable, OST becomes unusable without conversion.<br><strong>Exceeded OST size limit<\/strong>: If Outlook won&#8217;t start or sync properly due to file size, converting can offload older data.<br><strong>Portability needs<\/strong>: OST files are tied to one profile and not portable. Converting to PST allows easy import to another computer or profile.<br><strong>Migrating to other platforms<\/strong>: PST files are widely supported by third-party tools and facilitate migration from Exchange or Office 365.<br><strong>Selective recovery<\/strong>: Conversion tools often allow recovering specific folders from a corrupted OST file.<br><strong>How to Back Up OST Files Offline<\/strong><br>Using an <a href=\"https:\/\/www.bitrecover.com\/ost-to-pst\/\">OST to PST Converter<\/a> is the best way to maintain metadata integrity and prevent data loss. This software is a tested utility for restoring and converting damaged, corrupted, or inaccessible OST files.<br><strong>Steps to Save OST Files Offline:<\/strong><br>Download and launch the automated software.<br>Select \u201cCustomized Outlook mailbox data\u201d if needed.<br>Choose mailbox folders to export.<br>Select \u201cOutlook PST file\u201d as the destination format.<br>Choose the saving location and click <strong>Next<\/strong> to begin the export process.<br><strong>Signs Your OST File is Approaching the Limit<\/strong><br>When your OST file nears or exceeds the limit, you may encounter:<br>Slow Outlook performance<br>Delayed sending\/receiving of emails<br>Calendar sync issues<br>File size warning messages<br>Unexpected Outlook hangs or crashes<br>These signs indicate it\u2019s time to reduce OST size, archive old data, or increase the storage limit manually.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Risks_of_Hitting_the_OST_File_Size_Limit_in_Outlook_2016\"><\/span><br><strong>Risks of Hitting the OST File Size Limit in Outlook 2016<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>When the OST file gets too large, it can severely affect Outlook and data integrity. Although Outlook 2016 supports OSTs up to 50 GB, surpassing the limit may cause:<br>Slow loading and syncing of mail items, impacting productivity<br>Incomplete server synchronization, leading to outdated emails or calendars<br>Corruption risk, which may render the OST unreadable<br>Outlook crashes, hangs, or refusal to open<br>Backup and recovery complications, since OST files are not portable without conversion<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Check_OST_File_Size_in_Outlook_2016\"><\/span><br><strong>How to Check OST File Size in Outlook 2016<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br><strong>1. Check via Outlook:<\/strong><br>Open Outlook 2016.<br>Go to <strong>File \u2192 Info<\/strong>.<br>Under <strong>Mailbox Settings<\/strong>, click <strong>Tools \u2192 Mailbox Cleanup<\/strong>, then <strong>View Mailbox Size<\/strong>.<br>Review the total size (including subfolders) in KB. Around 47,500,000 KB (~47.5 GB) means you&#8217;re nearing the warning limit.<br><strong>2. Check via File Explorer:<\/strong><br>Open File Explorer.<br>Navigate to:<br>C:\\Users\\&lt;YourUsername>\\AppData\\Local\\Microsoft\\Outlook<br>Right\u2011click the OST file \u2192 <strong>Properties<\/strong>.<br>If AppData is hidden, enable hidden items in Explorer\u2019s View menu.<br><strong>How to Increase the OST File Size Limit in Outlook 2016<\/strong><br>Outlook 2016 defaults to a 50 GB OST file limit, but you can increase it via the Windows Registry. <strong>(Warning: Incorrect registry edits can harm your system, so back up before proceeding.)<\/strong><br><strong>Steps:<\/strong><br>Press <strong>Win + R<\/strong>, type <strong>regedit<\/strong>, and press Enter.<br>Navigate to:<br>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\16.0\\Outlook\\PST<br>Create or modify two DWORD values (in MB):<br><strong>MaxLargeFileSize<\/strong> \u2013 maximum OST size<br><strong>WarnLargeFileSize<\/strong> \u2013 warning threshold<br>Recommended settings:<br>MaxLargeFileSize = 102400 (100 GB)<br>WarnLargeFileSize = 97280 (95 GB)<br>Close Registry Editor and restart Outlook 2016 to apply changes.<br><strong>Tips for Managing OST File Size Effectively<\/strong><br>Even with a higher limit, proactive management keeps OST files healthy:<br><strong>Archive old emails regularly<br><\/strong>\u00a0File \u2192 Options \u2192 Advanced \u2192 AutoArchive \u2192 Move items older than a specified time to PST.<br><strong>Clean Deleted and Junk folders<br><\/strong>\u00a0Right-click those folders \u2192 <strong>Empty Folder<\/strong> to free up space.<br><strong>Compact the OST file<br><\/strong>\u00a0File \u2192 Account Settings \u2192 Data Files \u2192 select OST \u2192 Settings \u2192 Advanced \u2192 <strong>Compact Now<\/strong>.<br><strong>Find and archive large attachments<br><\/strong>\u00a0Use search to locate emails with big attachments and move them to a PST.<br><strong>Disable shared folder syncing<br><\/strong>\u00a0In Account Settings \u2192 Mailbox Settings \u2192 uncheck <strong>Download shared folders<\/strong> if not needed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><br><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><br>This guide covers the OST file size limits in Outlook 2016, how to monitor file size and location, and techniques to preserve your data. If you found this useful, you now have the insights you need to prevent OST limit issues and ensure a smooth offline mail experience.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is the OST file size limit in Outlook 2016? The OST (Offline Storage Table) file is a local copy [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":27083,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[66],"tags":[],"class_list":["post-27082","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Outlook 2016 OST File Size Limit \u2013 Complete Guide<\/title>\n<meta name=\"description\" content=\"Facing Outlook 2016 OST File Size Limit? 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