{"id":19678,"date":"2025-11-07T11:30:50","date_gmt":"2025-11-07T11:30:50","guid":{"rendered":"https:\/\/www.sysinfotools.com\/blog\/?p=19678"},"modified":"2025-11-07T11:30:51","modified_gmt":"2025-11-07T11:30:51","slug":"ost-file-is-full","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/ost-file-is-full\/","title":{"rendered":"OST File Is Full? Fix the \u201cOST File Too Large\u201d Error Quickly"},"content":{"rendered":"<div class=\"block_sum\">If your MS Outlook suddenly starts throwing the warning message, &ldquo;OST file is full,&rdquo; then do not panic. This is a common error that multiple users and professionals face as their mailbox grows with years of emails, contacts, calendars, and other data. This results in low sync time, inability to send\/receive emails, and so on. And the primary root cause is that your OST file size is too large to handle. So, let&rsquo;s understand what it is, why it happens, and how to fix it with some free tricks and a professional and reliable <a href=\"https:\/\/www.sysinfotools.com\/ost-splitter.php\"><strong>OST Splitter Tool<\/strong><\/a>.<p class=\"blog-btn\"><a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfoTools-OST-Splitter.exe\"><i class=\"icon-windows\"><\/i>  Download<\/a>   <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/ost-splitter.php\"><i class=\"icon icon-basket\"><\/i>  Buy Now<\/a><\/p><\/div>\n<p>Furthermore, take a look at this <strong>query<\/strong> from a user worried about the OST file size issue:<\/p>\n<img decoding=\"async\" src=\"https:\/\/www.sysinfotools.com\/blog\/wp-content\/uploads\/2025\/11\/image-4.png\" alt=\"User Query\" \/>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<div class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/div>\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:\/\/www.sysinfotools.com\/blog\/ost-file-is-full\/#Outlook_OST_File_Too_Large_What_You_Must_Know\" >Outlook OST File Too Large: What You Must Know<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.sysinfotools.com\/blog\/ost-file-is-full\/#Reasons_and_Results_of_the_OST_File_is_Full_Error\" >Reasons and Results of the OST File is Full Error<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.sysinfotools.com\/blog\/ost-file-is-full\/#How_to_Fix_the_OST_File_Too_Large_Issue\" >How to Fix the OST File Too Large Issue?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.sysinfotools.com\/blog\/ost-file-is-full\/#Troubleshoot_the_OST_File_Is_Full_Issue_Free\" >Troubleshoot the OST File Is Full Issue Free<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.sysinfotools.com\/blog\/ost-file-is-full\/#Resolve_OST_File_Is_Full_Issue_Like_A_Pro\" >Resolve OST File Is Full Issue Like A Pro<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.sysinfotools.com\/blog\/ost-file-is-full\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Outlook_OST_File_Too_Large_What_You_Must_Know\"><\/span>Outlook OST File Too Large: What You Must Know<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>OST (Offline Storage Table) is an offline copy of Outlook&rsquo;s cache exchange data stored on your OS locally. You can easily work on it without the internet, and the changes sync automatically when you go online. But Microsoft has some specified size limits for OST files to prevent performance degradation. These are:<\/p>\n<ul>\n<li><strong>2 GB<\/strong> for Outlook <strong>2002<\/strong> and <strong>earlier<\/strong> versions<\/li>\n<li><strong>20 GB<\/strong> for Outlook <strong>2010<\/strong> and <strong>earlier<\/strong> versions<\/li>\n<li><strong>50 GB<\/strong> for Outlook <strong>2013<\/strong> and <strong>later <\/strong>versions<\/li>\n<\/ul>\n<p>Moving ahead, let&rsquo;s understand the causes and symptoms of the <a href=\"https:\/\/www.sysinfotools.com\/blog\/handle-oversized-ost-file\/\"><strong>Oversized OST File<\/strong><\/a><strong>.<\/strong><\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Reasons_and_Results_of_the_OST_File_is_Full_Error\"><\/span>Reasons and Results of the OST File is Full Error<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Why does the OST File Get Large?<\/strong><\/p>\n<ul>\n<li>Accumulated cache mail data (emails, contacts, etc.) for many years locally.<\/li>\n<li>Stored media-heavy emails, shared files, and attachments within Outlook.<\/li>\n<li>Deleted items don&rsquo;t necessarily free server space until the OST file compacts.<\/li>\n<li>Connecting multiple shared mailboxes and archives increases offline cache data volume.<\/li>\n<\/ul>\n<p><strong>What happens when the OST is Large?<\/strong><\/p>\n<ul>\n<li>MS Outlook starts to hang or crash during startup or in between processes.<\/li>\n<li>Triggered &ldquo;<a href=\"https:\/\/www.sysinfotools.com\/blog\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/\"><strong>OST is in use and cannot be accessed<\/strong><\/a>&rdquo; and &ldquo;<a href=\"https:\/\/www.sysinfotools.com\/blog\/ost-file-size-not-reducing-after-archiving\/\"><strong>OST file size not reducing<\/strong><\/a>&rdquo; errors.<\/li>\n<li>Blocked synchronization with the MS Exchange and IMAP servers for data transfer.<\/li>\n<li>Results in partial data loss, missing files, or <a href=\"https:\/\/www.sysinfotools.com\/blog\/repair-corrupt-ost-file\/\"><strong>OST corruption<\/strong><\/a> during the sync.<\/li>\n<\/ul>\n<p>Furthermore, check out this &ldquo;<strong>User Query &rdquo;<\/strong> for a similar issue:<\/p>\n<img decoding=\"async\" src=\"https:\/\/www.sysinfotools.com\/blog\/wp-content\/uploads\/2025\/11\/image-3.png\" alt=\"User Query\" \/>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Fix_the_OST_File_Too_Large_Issue\"><\/span>How to Fix the OST File Too Large Issue?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If your <a href=\"https:\/\/www.sysinfotools.com\/blog\/outlook-ost-has-reached-maximum-size-error\/\"><strong>Outlook OST has reached maximum size<\/strong><\/a> and you need an immediate resolution for it, then the best way is to use the advanced <strong>OST Splitter Tool.<\/strong> However, if you have time, then you can also try out some <strong>free methods<\/strong> to fix and resolve the issue manually. You can briefly understand all the available fixes in this section.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Troubleshoot_the_OST_File_Is_Full_Issue_Free\"><\/span>Troubleshoot the OST File Is Full Issue Free<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you are comfortable with the Outlook settings and well aware of its functions, then these manual fixes can help you free up storage without costs. The methods are:<\/p>\n<p><strong>1) Compact Outlook OST File<\/strong><\/p>\n<ol>\n<li>First, from your Outlook profile, open <strong>Account Settings <\/strong>under the <strong>File<\/strong> tab.<\/li>\n<li>Then, from the<strong> Data Files<\/strong> tab, choose your<strong> OST<\/strong> and click <strong>Settings<\/strong>.<\/li>\n<li>Further, in <strong>Advanced<\/strong>, move to <strong>Outlook Data File Settings<\/strong>.<\/li>\n<li>There, click <strong>Compact Now<\/strong>. It will reduce your OST file size by compressing the unused storage space.<\/li>\n<\/ol>\n<p><strong>2) Reduce the Size of the Cache Mail<\/strong><\/p>\n<ol>\n<li>Within your <strong>Account Settings<\/strong>, double-click the <strong>email account<\/strong> with the OST file.<\/li>\n<li>Then, adjust the slider for <strong>Mail to Keep Offline<\/strong> to a <strong>smaller duration<\/strong> (say, 6 months).<\/li>\n<li>Finally, <strong>restart<\/strong> your <strong>Outlook<\/strong> profile to <strong>re-sync<\/strong> and manage the Outlook OST file too big.<\/li>\n<\/ol>\n<p><strong>3) Archive Old OST Emails<\/strong><\/p>\n<ol>\n<li>Within the Outlook <strong>File<\/strong>, move to the <strong>Tools<\/strong> and click on <strong>Cleanup Old Items<\/strong>.<\/li>\n<li>Or, choose the <strong>Mailbox Cleanup &gt;&gt; Auto Archive<\/strong> to empty the space.<\/li>\n<\/ol>\n<p><strong>4) Empty Deleted Items Folder<\/strong><\/p>\n<ol>\n<li>Initially, clear your <strong>Deleted Items\/Trash folder<\/strong> on a regular basis in Outlook.<\/li>\n<li>Also, for emails with <strong>large attachments<\/strong>: either move them to <strong>OneDrive <\/strong>or <strong>delete<\/strong> those that are not needed.<\/li>\n<\/ol>\n<p><strong>5) Turn RSS Feed Off<\/strong><\/p>\n<ol>\n<li>In your<strong> Account Settings<\/strong> within <strong>Outlook<\/strong>, find <strong>RSS Feeds<\/strong>.<\/li>\n<li>Then,<strong> Delete <\/strong>or <strong>Disable<\/strong> it.<\/li>\n<\/ol>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Resolve_OST_File_Is_Full_Issue_Like_A_Pro\"><\/span>Resolve OST File Is Full Issue Like A Pro<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Manual cleanup processes are a temporary solution to <a href=\"https:\/\/www.sysinfotools.com\/how-to\/reduce-ost-file-size.html\"><strong>reduce OST file size<\/strong><\/a> and resolve the issue. However, for deep structural issues, like when your Outlook starts to lag because of the size conflicts, an automated solution is needed. The <strong>SysInfo OST Splitter Tool<\/strong> helps compress bulk volumes of large OST files easily. Additionally, it has multiple split options for an OST file too large, removes duplicates, and works flawlessly on all versions of your Windows OS. Moreover, with its fast speed, efficiency, and precision, you can regain control over your data without loss and with no downtime in a minimal period.<\/p>\n<p><strong>Steps to Fix the Outlook OST File Too Big<\/strong><\/p>\n<ol>\n<li>Launch the <strong>OST File Splitter<\/strong> and click <strong>Add File\/Add Folder<\/strong> as needed.<\/li>\n<li>Then, choose the <strong>OST<\/strong> files from your system and click <strong>Open<\/strong> to load.<\/li>\n<li>Tap <strong>Next<\/strong>. Further, choose the folders you want to split from the file.<\/li>\n<li>Afterward, pick to <strong>Split by Size, Date, Sender,<\/strong> and<strong> Folders,<\/strong> and tap <strong>Next<\/strong>.<\/li>\n<li>Later, apply the filters and click <strong>Choose to<\/strong> input a destination.<\/li>\n<li>Finally, click the <strong>Split<\/strong> button to manage the Outlook OST file too large.<\/li>\n<\/ol>\n<p>Now, you have regained control over your Outlook OST file successfully and smoothly.<\/p>\n<div style=\"background: linear-gradient(135deg, #FAFDFF, #DDF2FF);border-left: 5px solid #1E4258;border-radius: 12px;padding: 20px 25px;margin: 15px 0;box-shadow: 0 4px 14px rgba(0,0,0,0.08);transition: all 0.3s ease;font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;color: #2A2A2A;\">\n  <p style=\"color: #10394C;font-weight: 700;font-size: 24px;margin-bottom: 12px;\">Real Case<\/p>\n  <p style=\"line-height: 1.7; font-size: 15px; margin-bottom: 12px;\">\n<strong>Marvicko Brewer,<\/strong> a project manager employed by a <strong>consulting firm,<\/strong> experienced Outlook freezing while in a team meeting for project work updates. After verifying, the OST file size was over <strong>48 GB<\/strong>. A <strong>manual compaction<\/strong> on the file made a minor change, but it wasn&#8217;t enough to resolve the issue. She proceeded to use the <strong>OST File Split Tool,<\/strong> which split her data into <strong>several PSTs <\/strong>while retaining the project&#8217;s communication history. This enabled Outlook&#8217;s performance to operate at its full potential again.<\/p>\n<\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Unfortunately, &#8220;OST file is full&#8221; is simply a warning from Outlook that it&#8217;s time to maintain the file. Ignoring this indication can lead to poor performance and syncs. In most cases, the first action required means cleaning and compacting manually. Although for an OST file that is corrupted, has sluggish performance, or is just too big, a professional fix means using an OST File Splitter to provide a fast and effective way to recover files.<\/p>\n<h4 class=\"faq_heading\">FAQs<\/h4>\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1762512071829\"><strong class=\"schema-faq-question\">Q. What is the maximum file size for an OST from the Outlook 2021 version?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans-<\/strong> Outlook 2021 by default supports Online Storage (OST) file sizes up to 50 GB. Although with adjustments to either the registry or settings, you can increase the file size limits.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1762512090036\"><strong class=\"schema-faq-question\">Q. Can I delete the OST directly to fix the OST file too large issue?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans-<\/strong> Yes, if the email provider is Microsoft Exchange or uses IMAP. MS Outlook will rebuild the OST on the next sync, but you will lose any unsynced data.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1762512105528\"><strong class=\"schema-faq-question\">Q. How can I safely manage the Outlook OST file too big problem without loss?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans-<\/strong> You can use the <strong>Compact Now<\/strong> feature in Outlook. An advanced storage space approach would be to use the <strong>OST Splitter<\/strong> to convert and split the OST into multiple PST files.<\/p> <\/div> <\/div>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;19678&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;1&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (1 vote)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;OST File Is Full? Fix the \u201cOST File Too Large\u201d Error Quickly&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (1 vote)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>If your MS Outlook suddenly starts throwing the warning message, &ldquo;OST file is full,&rdquo; then do not panic. This is<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/ost-file-is-full\/\">Read More<\/a><\/p>\n","protected":false},"author":15,"featured_media":19684,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1588],"tags":[],"class_list":["post-19678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ms-outlook"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>OST File Is Full? Fix the \u201cOST File Too Large\u201d Error Quickly<\/title>\n<meta name=\"description\" content=\"Struggling with the &quot;OST file is full&quot; issue? 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