{"id":5142,"date":"2026-05-05T09:31:40","date_gmt":"2026-05-05T09:31:40","guid":{"rendered":"https:\/\/www.softaken.com\/guide\/?p=5142"},"modified":"2026-05-06T05:45:23","modified_gmt":"2026-05-06T05:45:23","slug":"increase-outlook-ost-file-size-limit","status":"publish","type":"post","link":"https:\/\/www.softaken.com\/guide\/increase-outlook-ost-file-size-limit\/","title":{"rendered":"How to Increase Outlook OST File Size Limit (2026 Updated Guide)"},"content":{"rendered":"<p><strong>Summary<\/strong><\/p>\n<p>Most people ignore the storage of Outlook data files until Outlook displays a warning message. Then Outlook creates sudden troubles like email won\u2019t sync, slow search, and Outlook just freezes for an obvious reason. The OST file increases in size as Outlook syncs emails, attachments, meeting data, and other mailbox items from the server. So, if you want to Increase Outlook OST file size limit, then you need to follow this guide. In this article, we will walk through all these troubles and go through different approaches to resolve the problems.<\/p>\n<p>You can increase the OST file size limit by configuring two registry values (MaxLargeFileSize and WarnLargeFileSize) or by deploying the same settings through Group Policy (GPO) in an enterprise environment. This guide will explain the steps to use that method to increase the OST file Size.<\/p>\n<p><strong>Also read:<\/strong> <a href=\"https:\/\/www.softaken.com\/guide\/proven-ways-to-fix-outlook-stuck-in-offline-mode-error\/\">Fix Outlook Stuck in Offline Mode<\/a><\/p>\n<h2>Why does the OST file Become Large in Size?<\/h2>\n<p>The OST file grows randomly; they expand due to multiple data storage.<\/p>\n<ul>\n<li><strong>High email volume: <\/strong>Due to regular updates and work, the size of emails might increase, which causes slow performance, lagging, and many other problems.<\/li>\n<li><strong>Large attachments: <\/strong>The major reason OST becomes large in size is large attachments such as PDFs, videos, reports, and design files.<\/li>\n<li><strong>Multiple folders synced: <\/strong>The storage is generated from shared mailboxes and archives data.<\/li>\n<li><strong>Calendar and Teams data: <\/strong>The data that is received by the other individuals also causes storage, such as meeting logs and collaboration records.<\/li>\n<\/ul>\n<p><strong><em>Note: <\/em><\/strong><em>A continuously growing OST file can lead to a performance issue and also the risk of corruption if not managed timely<\/em><\/p>\n<h2>Common Signs the OST File Has Reached Maximum Size<\/h2>\n<p>Some of the common signs that Outlook begins to behave unpredictably and start giving warning signs.<\/p>\n<p><strong>Slow Outlook Performance<\/strong><\/p>\n<ul>\n<li><strong>Significance<\/strong>: Outlook&#8217;s performance tends to degrade, which leads to the OST file getting bigger. Outlook can start slowly or become Slow when you switch between folders, emails, or searches.<\/li>\n<li><strong>Cause<\/strong>: Outlook can take longer to retrieve, index, and display data from large files.<\/li>\n<\/ul>\n<p><strong>Outlook Freezes or Crashes<\/strong><\/p>\n<ul>\n<li><strong>Significance<\/strong>: The OST file can be too big for the system to handle if Outlook unexpectedly crashes while syncing or completing tasks, particularly if you have a lot of attachments or folders.<\/li>\n<li><strong>Cause<\/strong>: When Outlook attempts to handle huge volumes of data, an excessive OST file can strain the system&#8217;s resources and cause crashes.<\/li>\n<\/ul>\n<p><strong>Emails Not Syncing or Not Sending<\/strong><\/p>\n<ul>\n<li><strong>Significance<\/strong>: The OST file can be too big to store new data if you see that your emails are not synchronising or that you are unable to send new emails from Outlook.<\/li>\n<li><strong>Cause<\/strong>: Outlook cannot sync with the mail server due to the file exceeding its limit, which would stop new messages from being downloaded or sent.<\/li>\n<\/ul>\n<p><strong>Search Functionality Stops Working<\/strong><\/p>\n<ul>\n<li><strong>Significance<\/strong>: One of the most frequent problems with big OST files is that Outlook&#8217;s Search feature stops functioning properly. It does not locate any relevant emails at all, or it takes a long time to deliver results.<\/li>\n<li><strong>Cause<\/strong>: When an OST file is huge, Outlook must index a lot of data, which slows down search capabilities or prevents accurate results from being retrieved.<\/li>\n<\/ul>\n<p><strong>High CPU and Memory Usage<\/strong><\/p>\n<ul>\n<li><strong>Significance<\/strong>: Outlook uses high CPU and memory resources, when the OST file is too big. Your system can become considerably slower as a result, particularly when attempting to complete operations like sending and receiving emails or syncing folders.<\/li>\n<li><strong>Cause<\/strong>: The file&#8217;s large size can cause Outlook to work overtime to sync, process and index all the data, leading to system performance issues.<\/li>\n<\/ul>\n<p><strong>Unable to Add More Data or Attachments<\/strong><\/p>\n<ul>\n<li><strong>Significance<\/strong>: The OST file has exceeded its size limit if Outlook declines to accept new emails or attachments.<\/li>\n<li><strong>Cause<\/strong>: There is simply not enough space left in the OST file to store more data, which can prevent further email data from being saved or synced.<\/li>\n<\/ul>\n<p><strong>Corrupted OST File<\/strong><\/p>\n<ul>\n<li><strong>Significance<\/strong>: Data loss or problems like incomplete email syncing or a Lack of ability to launch the Outlook program, which is caused by a corrupt OST file.<\/li>\n<li><strong>Cause<\/strong>: A large OST file is more prone to corruption, especially if the file reaches its size limit or if it&#8217;s being accessed by multiple devices at once.<\/li>\n<\/ul>\n<p><strong>Delayed or Missing Notifications<\/strong><\/p>\n<ul>\n<li><strong>Significance<\/strong>: Another sign is if you are receiving notifications from Outlook later than expected, or if some notifications are missing entirely.<\/li>\n<li><strong>Cause<\/strong>: If the OST file is too big to sync fast, Outlook cannot deliver updates and notifications on time.<\/li>\n<\/ul>\n<h2>When You Should Increase Outlook OST File Size Limit<\/h2>\n<table style=\"width: 80.8623%; height: 240px;\" width=\"671\">\n<tbody>\n<tr style=\"height: 24px;\">\n<td style=\"height: 24px;\" width=\"58\"><strong>No.<\/strong><\/td>\n<td style=\"height: 24px;\" width=\"252\"><strong>Scenario<\/strong><\/td>\n<td style=\"height: 24px;\" width=\"361\"><strong>Why Increase the Limit<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 48px;\">\n<td style=\"height: 48px;\" width=\"58\"><strong>1<\/strong><\/td>\n<td style=\"height: 48px;\" width=\"252\">Growing Mailbox Size<\/td>\n<td style=\"height: 48px;\" width=\"361\">Prevent the mailbox from hitting the default size and avoid interruptions in the workflow<\/td>\n<\/tr>\n<tr style=\"height: 48px;\">\n<td style=\"height: 48px;\" width=\"58\"><strong>2<\/strong><\/td>\n<td style=\"height: 48px;\" width=\"252\">Size limit Warnings<\/td>\n<td style=\"height: 48px;\" width=\"361\">Resolves errors like \u201cdata file has reached maximum size\u201d<\/td>\n<\/tr>\n<tr style=\"height: 48px;\">\n<td style=\"height: 48px;\" width=\"58\"><strong>3<\/strong><\/td>\n<td style=\"height: 48px;\" width=\"252\">Email Not Syncing<\/td>\n<td style=\"height: 48px;\" width=\"361\">Resume sending and receiving of emails with any issues<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"height: 24px;\" width=\"58\"><strong>4<\/strong><\/td>\n<td style=\"height: 24px;\" width=\"252\">Performance Issues<\/td>\n<td style=\"height: 24px;\" width=\"361\">Reduce lag due to near the OST File size limit<\/td>\n<\/tr>\n<tr style=\"height: 48px;\">\n<td style=\"height: 48px;\" width=\"58\"><strong>5<\/strong><\/td>\n<td style=\"height: 48px;\" width=\"252\">Enterprise Environment<\/td>\n<td style=\"height: 48px;\" width=\"361\">Maintain performance when users handle large amounts of data<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Methods to Increase OST File Size in MS Outlook<\/h2>\n<p>There are two primary approaches:<\/p>\n<p><strong>Approach 1: Registry Editor (Manual method)<\/strong><\/p>\n<p><strong>Approach 2: Group Policy Editor (Organizational level control)<\/strong><\/p>\n<h2>Understanding the OST Registry and Group Policies (GPO)<\/h2>\n<p>Outlook uses specific registry values to define maximum OST size and warning thresholds, which include:<\/p>\n<p><strong>OST Registry<\/strong><\/p>\n<p>Outlook uses Windows Registry settings to control the OST and PST file size behaviour. These Guidelines allow you to modify the OST file&#8217;s size, location and performance. For example, you can set a maximum size limit. To prevent the OST file from getting too large.\u00a0 It provides a special location. By modifying these settings, Outlook&#8217;s performance can be improved. This reduces the risk of corruption. And user data can be efficiently saved.<\/p>\n<p><strong>Group Policies (GPO)<\/strong><\/p>\n<p>Group Policy Objects (GPO) are used in corporate settings. So that it centrally controls settings for multiple devices and individuals. Several OST file management capabilities in Outlook can be controlled by GPOs. For example, GPOs enable administrators. It determines the maximum size of an OST file, disable Cached Exchange Mode and change the default placement of OST files. These settings help preserve consistency across all user PCs and avoid issues with big OST files or poor Outlook performance.<\/p>\n<h3>Method 1: Use Registry Editor to Increase OST File Size<\/h3>\n<p>Enter regedit after pressing Win + R, then hit Enter.<\/p>\n<p><strong>Go to the path of the Outlook version:<\/strong><\/p>\n<p><strong>For Outlook 2013:<\/strong><\/p>\n<p>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\15.0\\Outlook\\PST<\/p>\n<p><strong>For Outlook 2016 \/ 2019 \/ Microsoft 365:<\/strong><\/p>\n<p>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\16.0\\Outlook\\PST<\/p>\n<p>Make the following DWORD values or change them:<\/p>\n<ul>\n<li>MaxLargeFileSize<\/li>\n<li>WarnLargeFileSize<\/li>\n<\/ul>\n<p>Set values in decimal format (MB).<\/p>\n<p>Restart Outlook.<\/p>\n<h4>Registry Values for Common OST Size<\/h4>\n<table>\n<tbody>\n<tr>\n<td width=\"208\"><strong>OST Size Limit<\/strong><\/td>\n<td width=\"208\"><strong>MaxLargeFileSize<\/strong><\/td>\n<td width=\"208\"><strong>WarnLargeFileSize<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"208\">50 GB (Default)<\/td>\n<td width=\"208\">51200<\/td>\n<td width=\"208\">48640<\/td>\n<\/tr>\n<tr>\n<td width=\"208\">75 GB<\/td>\n<td width=\"208\">76800<\/td>\n<td width=\"208\">73728<\/td>\n<\/tr>\n<tr>\n<td width=\"208\">100 GB<\/td>\n<td width=\"208\">102400<\/td>\n<td width=\"208\">97280<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Note:<\/strong> This Registry setting apply to both OST and PST file<\/p>\n<h3>Method 2: Use Group Policies (GPO) to Increase OST File Size Limit<\/h3>\n<p>These methods require proper precision and need to follow proper steps. This method is useful for IT administrators.<\/p>\n<p>Press <strong>Win+R<\/strong> and Enter <strong>(gpedit.msc)<\/strong><\/p>\n<figure id=\"attachment_5173\" aria-describedby=\"caption-attachment-5173\" style=\"width: 387px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5173 size-full\" src=\"https:\/\/www.softaken.com\/guide\/wp-content\/uploads\/2026\/05\/1.png\" alt=\"Windows Run dialog showing gpedit.msc command to open Group Policy Editor for increasing Outlook OST file size limit\" width=\"387\" height=\"195\" srcset=\"https:\/\/www.softaken.com\/guide\/wp-content\/uploads\/2026\/05\/1.png 387w, https:\/\/www.softaken.com\/guide\/wp-content\/uploads\/2026\/05\/1-300x151.png 300w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><figcaption id=\"caption-attachment-5173\" class=\"wp-caption-text\">Opening the Windows Run dialog and entering gpedit.msc to access Group Policy Editor for Outlook OST file size settings.<\/figcaption><\/figure>\n<p><strong>Navigate to:<\/strong><\/p>\n<figure id=\"attachment_5174\" aria-describedby=\"caption-attachment-5174\" style=\"width: 624px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5174 size-full\" src=\"https:\/\/www.softaken.com\/guide\/wp-content\/uploads\/2026\/05\/2.png\" alt=\"Windows Group Policy Editor screen for configuring Outlook OST and PST size limit through Administrative Templates\" width=\"624\" height=\"438\" srcset=\"https:\/\/www.softaken.com\/guide\/wp-content\/uploads\/2026\/05\/2.png 624w, https:\/\/www.softaken.com\/guide\/wp-content\/uploads\/2026\/05\/2-300x211.png 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><figcaption id=\"caption-attachment-5174\" class=\"wp-caption-text\">Selecting Administrative Templates in Local Group Policy Editor to configure Outlook OST file size limit settings.<\/figcaption><\/figure>\n<ul>\n<li>User Configuration<\/li>\n<li>Administrative Templates<\/li>\n<li>Microsoft Outlook (version)<\/li>\n<li>Outlook Options<\/li>\n<li>Other<\/li>\n<li>PST Settings<\/li>\n<\/ul>\n<p><strong>Enable the Policies:<\/strong><\/p>\n<ul>\n<li>Maximum size of the OST and PST files<\/li>\n<li>Warn the user when the OST and PST files approach<\/li>\n<\/ul>\n<p>Configure the values according to the requirement.<\/p>\n<p>Now, Restart the MS Outlook<\/p>\n<p><strong>Note: <\/strong>If you do not see <strong>PST Settings<\/strong>, install the latest Administrative Templates (ADMX) for Microsoft Office\/Outlook.<\/p>\n<h2>When OST Size Increase Doesn\u2019t Fix Issues<\/h2>\n<p><strong>Increase Outlook OST File Size Limit<\/strong> main problem is not the size limit; it could be structural damage or inefficiency<\/p>\n<ul>\n<li><strong>Corrupted OST File<\/strong><\/li>\n<\/ul>\n<p>If the OST file is already damaged, increasing it won\u2019t fix it. Corruption often occurs due to abrupt shutdown, network interruption, or oversized files.<\/p>\n<ul>\n<li><strong>Need to Compact OST File<\/strong><\/li>\n<\/ul>\n<p>Even after deleting the emails, OST files don\u2019t shrink automatically. Compaction helps reclaim unused space and improve performance.<\/p>\n<ul>\n<li><strong>Inaccessible or Corrupted OST File<\/strong><\/li>\n<\/ul>\n<p>In case the OST file becomes inaccessible due to oversizing, then you need to utilise a reputable and professional tool like <strong>Softaken <a href=\"https:\/\/www.softaken.com\/ost-to-pst-converter\">OST Converter<\/a><\/strong>. This software assists users in recovering data from the corrupted OST files, converting OST into an accessible PST format, and preserving folder structure and attachments. If you really need to increase the OST limit, then this application is perfect for you. This tool makes your work smooth and effortless. The tool offers a free demo version so that users can experience it.<\/p>\n<p style=\"text-align: center;\"><a class=\"maxbutton-1 maxbutton maxbutton-download-now\" target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.softaken.com\/dls\/count\/track.php?id=2\"><span class='mb-text'>Download Now<\/span><\/a> <a class=\"maxbutton-2 maxbutton maxbutton-buy-now\" target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.softaken.com\/buy-ost-file-exporter\"><span class='mb-text'>Buy Now<\/span><\/a><\/p>\n<h1>Conclusion<\/h1>\n<p>For modern Outlook users who have massive mailboxes, increase MS Outlook OST File Size Limit is a workable alternative. It is not recommended for use as a default solution, though; rather, it needs to be handled carefully. Although registry and group policy approaches are flexible, they don&#8217;t deal with more serious problems like corruption or ineffective data administration. Long-term stability and performance are ensured by a balanced strategy that combines size optimization, cleanup, and dependable tools.<\/p>\n<h3>Frequently Asked Questions (FAQs)<\/h3>\n<p><strong>What is the OST file Size Limit in Outlook?<\/strong><\/p>\n<p>The default size limit of the OST file in MS Outlook. In modern versions, it is 50 GB<\/p>\n<p><strong>Can I Increase the OST file Size Limit in Microsoft Outlook?<\/strong><\/p>\n<p>Yes, you can increase the OST file size limit in Outlook by using Registry Editor or Group Policy settings.<\/p>\n<p><strong>Is it Safe to Increase the OST file Size Limit?<\/strong><\/p>\n<p>Increasing the OST file size limit via the registry is possible, but it is not recommended.<\/p>\n<p><strong>What Happens if the OST file Reaches its Maximum Size?<\/strong><\/p>\n<p>Outlook stops syncing with new data, and users encounter an error or reduced performance.<\/p>\n<p><strong>How do I Fix a Corrupted OST file due to its Large Size?<\/strong><\/p>\n<p>To repair a corrupted OST file due to its huge size, remove unnecessary items and clear the &#8220;Deleted Items&#8221; folder, then use the &#8220;Compact Now&#8221; tool in Account Settings to minimise its size.<\/p>\n<p><strong>What Registry Keys Control the OST file Size in Outlook?<\/strong><\/p>\n<ul>\n<li>MaxLargeFileSize<\/li>\n<li>WarnLargeFileSize<\/li>\n<\/ul>\n<p><strong>What happens if WarnLargeFileSize is Not Set Correctly?<\/strong><\/p>\n<p>If the WarnLargeFileSize registry entry in Microsoft Outlook is not properly configured, it fails to offer an appropriate warning before an Outlook Data File reaches its maximum size.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Summary Most people ignore the storage of Outlook data files until Outlook displays a warning message. Then Outlook creates sudden troubles like email won\u2019t sync, slow search, and Outlook just freezes for an obvious reason. The OST file increases in size as Outlook syncs emails, attachments, meeting data, and other mailbox items from the server. [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":5144,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_sl_quick_summary":"Increase Outlook OST file size limit safely using Registry Editor or Group Policy. Learn warning signs, correct values, and fixes for slow syncing, freezing, and corrupted OST issues in 2026.","_sl_featured":"","_sl_entry_faq_json":"","footnotes":""},"categories":[26,40],"tags":[],"class_list":["post-5142","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-ost-file-exporter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Increase Outlook OST File Size Limit \u2013 Step-by-Step Guide<\/title>\n<meta name=\"description\" content=\"Increase Outlook OST file size limit in 2026 with simple steps to prevent errors, improve speed, and manage large OST files safely.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.softaken.com\/guide\/increase-outlook-ost-file-size-limit\/\" \/>\n<meta property=\"og:locale\" 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