{"id":5232,"date":"2026-06-13T09:39:32","date_gmt":"2026-06-13T09:39:32","guid":{"rendered":"https:\/\/www.sysinfotools.com\/blog\/?p=5232"},"modified":"2026-07-31T07:25:33","modified_gmt":"2026-07-31T07:25:33","slug":"repair-oversized-outlook-pst-file","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/","title":{"rendered":"Repair Oversized PST Files: Complete Outlook Recovery Guide"},"content":{"rendered":"<div class=\"block_sum\">\n<p>Outlook PSTs don\u2019t become oversized in one night; instead, they slowly fill up with constant email exchanges. The data accumulated over the years results in oversized PSTs affecting the performance and business workflows. Hence, it becomes necessary to repair oversized Outlook PST files to avoid risks and protect the critical and sensitive business data. This technical guide follows practical approaches, including a smart professional <a href=\"https:\/\/www.sysinfotools.com\/recovery\/pst-compress.php\" target=\"_blank\" rel=\"noopener\"><strong>PST Compress and Compact Tool<\/strong><\/a> for efficient repairs without data loss.<\/p>\n<div class=\"blog-btn\">\n<ul id=\"db-btn-container\" class=\"nav nav-tabs mt-4\" role=\"tablist\">\n<li class=\"nav-item\"><a id=\"windows-tab\" class=\"nav-link active\" role=\"tab\" href=\"#windows\" data-toggle=\"tab\" aria-controls=\"windows\" aria-selected=\"true\"><i class=\"icon-windows\"><\/i> Windows<\/a><\/li>\n<li class=\"nav-item\"><a id=\"mac-tab\" class=\"nav-link\" role=\"tab\" href=\"#mac\" data-toggle=\"tab\" aria-controls=\"mac\" aria-selected=\"false\"><i class=\"icon-apple\"><\/i> Mac<\/a><\/li>\n<\/ul>\n<div id=\"db-btn-containerContent\" class=\"tab-content my-2\">\n<div id=\"windows\" class=\"tab-pane fade active show\" role=\"tabpanel\" aria-labelledby=\"windows-tab\"><a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfoTools-PST-Compress-Compact.exe\"><i class=\"icon-windows\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/pst-compress.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/div>\n<div id=\"mac\" class=\"tab-pane fade\" role=\"tabpanel\" aria-labelledby=\"mac-tab\"><a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfoTools-PST-Compress-Compact-Mac.dmg\"><i class=\"icon-apple\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/mac-pst-compression.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"p-4 mb-4\" style=\"border: 2px solid #005EFF; border-radius: 30px;\">\n<p><strong>Common User Queries\u00a0<\/strong><\/p>\n<p><em><span style=\"font-weight: 400;\">\u201cI upgraded Microsoft Office 365 (from 2013) to a new version. Everything has been functioning well since the installation, except for Outlook. I keep receiving the same error message about my .pst data file being too large to send or receive emails. The folder displays 49,820 KB. I have increased the registry size, archived old emails, and deleted all messages over 250KB. That was all I could try to resolve the issue. After this, the mailbox volume displays 22,000KB. However, the PST file still remains at 49,820KB. Help me as I need to update my Office applications, and I couldn\u2019t find any suitable way to fix oversized PST.\u201d<\/span><\/em><\/p>\n<p><strong>tstep1868, r\/Office 365, Reddit Forum<\/strong><\/p>\n<p><em><span style=\"font-weight: 400;\">\u201cI have created a PST of approximately 1.5GB in size, and SCANPST.exe has failed to process the file successfully. My Outlook 2016 closes, unable to read the PST file. Is there an alternate tool that I can use other than SCANPST? My PST file was used to create a folder of folders. Let me know if you can assist with resolving this.\u201d<\/span><\/em><\/p>\n<p><strong>-Microsoft Q&amp;A<\/strong><\/p>\n<\/div>\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\/repair-oversized-outlook-pst-file\/#All_You_Need_to_Know_to_Repair_Oversized_Outlook_PST\" >All You Need to Know to Repair Oversized Outlook PST\u00a0<\/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\/repair-oversized-outlook-pst-file\/#Usual_Symptoms_of_an_Oversized_PST_File\" >Usual Symptoms of an Oversized PST File\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#How_PST_File_Become_Oversized\" >How PST File Become Oversized?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#Best_Ways_to_Instantly_Repair_Oversized_Outlook_PST\" >Best Ways to Instantly Repair Oversized Outlook PST\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#Method_1_Manual_PST_Size_Reduction\" >Method 1: Manual PST Size Reduction<\/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\/repair-oversized-outlook-pst-file\/#Method_2_Repair_Corrupt_PST_Files\" >Method 2: Repair Corrupt PST Files\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#Method_3_IT-Based_Repair_Oversized_Outlook_PST\" >Method 3: IT-Based Repair Oversized Outlook PST\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#Final_Remarks\" >Final Remarks\u00a0<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"All_You_Need_to_Know_to_Repair_Oversized_Outlook_PST\"><\/span>All You Need to Know to Repair Oversized Outlook PST\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PST (Personal Storage Table) file clearly stores the Outlook\u2019s entire mailbox data locally. Microsoft has constantly increased PST file limits over the years, but there are still thresholds. The common limits distributed over time are:<\/p>\n<ul>\n<li aria-level=\"1\"><strong><em>Earlier versions &#8211; Outlook 2002 (ANSI PST): 2 GB<\/em><\/strong><\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\"><strong>Outlook 2003 -2007 (UNICODE PST): 20 GB<\/strong><\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\"><strong>Outlook 2010 &#8211; Current versions (UNICODE PST): 50 GB<\/strong><\/li>\n<\/ul>\n<p>Though 50 GB is the max limit for PST supported currently, the performance generally degrades if the file contains large and bulky attachments, too. Thus, you must know <a href=\"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/\" target=\"_blank\" rel=\"noopener\"><strong>how to compress PST file<\/strong><\/a>.\u00a0<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Usual_Symptoms_of_an_Oversized_PST_File\"><\/span>Usual Symptoms of an Oversized PST File\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you want to fix large PST file, recognizing it is very important. This is only possible when you know what happens when the PST file size limit is exceeded. You may find the following warnings before Outlook completely fails to function:<\/p>\n<ul>\n<li aria-level=\"1\">Too much time is consumed when starting MS Outlook\u00a0<\/li>\n<li aria-level=\"1\">The system often freezes or crashes\u00a0<\/li>\n<li aria-level=\"1\">Emails are not sent or received in Outlook\u00a0<\/li>\n<li aria-level=\"1\">PST files cannot be synced or opened\u00a0<\/li>\n<li aria-level=\"1\">Outlook shows limit warnings, and items go missing\u00a0<\/li>\n<li aria-level=\"1\">Error messages: <a href=\"https:\/\/www.sysinfotools.com\/blog\/the-outlook-data-file-has-reached-the-maximum-size\/\" target=\"_blank\" rel=\"noopener\"><strong>Outlook data file has reached the maximum size<\/strong><\/a><\/li>\n<li aria-level=\"1\">\u201cxyz.pst cannot be accessed: code 0x80040116\u201d and other errors\u00a0<\/li>\n<li aria-level=\"1\">Routine tasks fail to perform, and Error 0x00040820 keeps repeating<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"How_PST_File_Become_Oversized\"><\/span>How PST File Become Oversized?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Factors mentioned below contribute to the growth of the Outlook data file over time, demanding you repair corrupt oversized Outlook PST files:<\/p>\n<ul>\n<li aria-level=\"1\">High-resolution images, videos, PDFs, large email attachments, and project files &#8211;<strong>Storage Out<\/strong><\/li>\n<li aria-level=\"1\">Repeated messages, synchronization duplicates, and copied folders- <strong>Inflated Mailbox\u00a0<\/strong><\/li>\n<li aria-level=\"1\">Years of historical data archived altogether in a single PST file &#8211; <strong>Long Archival<\/strong><\/li>\n<li aria-level=\"1\">Using older ANSI PST with 2 GB limits, <a href=\"https:\/\/www.sysinfotools.com\/blog\/easy-trick-convert-ansi-pst-unicode\/\" target=\"_blank\" rel=\"noopener\"><strong>convert ANSI PST to UNICODE PST<\/strong><\/a>&#8211; <strong>Outdated Format\u00a0<\/strong><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Best_Ways_to_Instantly_Repair_Oversized_Outlook_PST\"><\/span>Best Ways to Instantly Repair Oversized Outlook PST\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>We will discuss all the available manual fixes and the professional PST Compress or Split solutions. Also, we will study how to manage the corrupt PST files for free or with the dedicated solution without degrading the content or performance with or without Outlook.\u00a0<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Method_1_Manual_PST_Size_Reduction\"><\/span>Method 1: Manual PST Size Reduction<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>First, to restore the complete Outlook functionality:<\/p>\n<ol>\n<li aria-level=\"1\">Check <strong>unnecessary items<\/strong> within your <strong>PST<\/strong> file.\u00a0<\/li>\n<li aria-level=\"1\">Remove any <em>junk emails, items in trash, large attachments, <\/em>and <em>obsolete archives.\u00a0<\/em><\/li>\n<li aria-level=\"1\">Then, verify and <a href=\"https:\/\/www.sysinfotools.com\/blog\/remove-duplicate-emails-in-outlook\/\" target=\"_blank\" rel=\"noopener\"><strong>remove duplicate emails in Outlook<\/strong><\/a>.\u00a0<\/li>\n<li aria-level=\"1\">Further, you must compact and split the oversized PSTs with built-in options.\u00a0<\/li>\n<\/ol>\n<h4>A) Compact PST File\u00a0<\/h4>\n<p>To remove the unused space from your PST file, <em>MS Outlook has a built-in compression option<\/em>. But it will <em>only reduce file size and cannot repair corruption or handle severely damaged PSTs<\/em>. Steps to fix large PST file are:<\/p>\n<ol>\n<li aria-level=\"1\">Open <strong>MS Outlook<\/strong> and from the <strong>File<\/strong> tab, go to <strong>Account Settings<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Then, choose your <strong>Data Files<\/strong> and select the <strong>oversized PST<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Further, click <strong>Settings<\/strong> and then <strong>Advanced<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">From there, tap <strong>Outlook Data File Settings <\/strong>and tap <strong>Compact Now<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Wait until the process completes and the large PST files are compacted.\u00a0<\/li>\n<\/ol>\n<h4>B) Split &amp; Archive Legacy Data\u00a0<\/h4>\n<p>The best way to <em>prevent future issues is to split large PSTs and archive old ones<\/em>, reducing the size of the main PST file. Follow these steps:<\/p>\n<ol>\n<li aria-level=\"1\">In MS Outlook,<strong> File<\/strong> tab, under <strong>Info<\/strong>, click <strong>Tools<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Then, select<strong> Clean up Old Items,<\/strong> and a dialog opens.\u00a0<\/li>\n<li aria-level=\"1\">Further, choose <strong>Archive this folder and all subfolders<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Pick a <strong>date range<\/strong> to archive emails for and select a <strong>destination<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">At last, <strong>save<\/strong> your <strong>old PST<\/strong> emails in a <strong>new .pst archive<\/strong>.\u00a0<\/li>\n<\/ol>\n<p>If this doesn\u2019t help, you can use the expert trusted <a href=\"https:\/\/www.sysinfotools.com\/recovery\/pst-split.php\" target=\"_blank\" rel=\"noopener\"><strong>SysInfo PST Split Tool<\/strong><\/a> to repair oversized Outlook PST by splitting them in one go. It allows <em>division by Size, Folder, Date, and Sender&#8217;s ID<\/em> with full precision and ensures <em>faster Outlook performance, reduced corruption risks, and better mailbox management<\/em>. It is safe and can <em>manage single and multiple files simultaneously, keeping every folder item intact<\/em>.\u00a0<\/p>\n<h4>C) Increase PST Size Limit\u00a0<\/h4>\n<p>Within modern<em> Outlook interfaces (2010 or newer)<\/em>, anyone can <em>modify Windows Registry files to increase PST size limits upto 100 GB<\/em>. The steps to follow are:<\/p>\n<ol>\n<li aria-level=\"1\">Press <strong>Win+R<\/strong> to start the <strong>Run window<\/strong>, type <strong>regedit<\/strong> in it, and click <strong>OK<\/strong> or hit <strong>Enter<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Then, locate Registry files from <strong>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\z. 0\\Outlook\\PST <\/strong>(where z.0 is 16.0 for Outlook 2016, 2019, 2021, and 365)<\/li>\n<li aria-level=\"1\">Next, right-click anywhere in the <strong>right pane<\/strong> and tap <strong>New<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Select <strong>DWORD Value (32-bit)<\/strong> and give it a <strong>name<\/strong> as <strong>MaxLargePSTFileSize<\/strong>.<\/li>\n<li aria-level=\"1\">Furthermore, set it\u2019s <strong>Base<\/strong> in <strong>Decimal<\/strong> and input the <strong>size<\/strong> in <strong>MB<\/strong> (51200 for 50 GB\/102400 for 100 GB).<\/li>\n<li aria-level=\"1\">The PST file size will be reset to the newer value with more storage.\u00a0<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Method_2_Repair_Corrupt_PST_Files\"><\/span>Method 2: Repair Corrupt PST Files\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you were unable to fix oversized PST, and it caused crashes or errors in the file, it must be damaged\/corrupted by now. So, for the fix, <em>Microsoft built-in Inbox Repair Tool<\/em> is available, but it <em>works best only on files of upto 2 GB<\/em>. To <em>use on large files, first compact or split<\/em> them with the above-mentioned methods. To recover a corrupt PST, use these steps:<\/p>\n<ol>\n<li aria-level=\"1\">Initially, begin by closing the Microsoft Outlook application completely.\u00a0<\/li>\n<li aria-level=\"1\">Then, go to <strong>C:\\Program Files (x86)\\Microsoft Office\\root\\Office15\/16\u00a0<\/strong><\/li>\n<li aria-level=\"1\">There, locate<strong> ScanPST.exe<\/strong> and run the tool. Tap <strong>Browse<\/strong> from the dialog.\u00a0<\/li>\n<li aria-level=\"1\">Further, add the <strong>PST<\/strong> file that you want to repair and click <strong>Start<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">It will begin the scan and locate any errors. If found, hit <strong>Repair<\/strong> for the fix.\u00a0<\/li>\n<\/ol>\n<p>You must note that this method will <em>only deal with minor complexities and fixes.<\/em> It <em>cannot handle severe data corruption or damage<\/em>. To ensure you can repair inaccessible or severely corrupted PST files, use <a href=\"https:\/\/www.sysinfotools.com\/recovery\/pst-recovery.php\" target=\"_blank\" rel=\"noopener\"><strong>SysInfo PST File Recovery Tool<\/strong><\/a>. It <em>fixes all small and big structural inconsistencies, handles oversized PSTs, and recovers all with 100% accuracy without any data loss. <\/em>The business-critical information is kept secure, and enterprises achieve great reliability.\u00a0<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Method_3_IT-Based_Repair_Oversized_Outlook_PST\"><\/span>Method 3: IT-Based Repair Oversized Outlook PST\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Administrators managing large Outlook environments require a professional solution to fix large PSTs without corruption or data loss risks. Once you have recovered PST from damage or corruption, you can use <strong>SysInfo PST Compress and Compact Tool<\/strong> to reduce the large PST file size significantly with ease. It flawlessly shrinks the file, removes or extracts the large attachments, and maintains data integrity. With full support for both ANSI and UNICODE PSTs from all Outlook versions, it runs flexibly across all Windows and Mac OS.\u00a0<\/p>\n<p><strong>Steps to Fix Oversized PST Files<\/strong>\u00a0<\/p>\n<ol>\n<li aria-level=\"1\">Launch the <strong>SysInfo PST Compact Tool <\/strong>and choose <strong>Single\/Multiple<\/strong> file. Tap <strong>Next<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Then, with the <strong>Select File<\/strong> or <strong>Select Folder <\/strong>option, upload <strong>oversized PSTs <\/strong>and click <strong>Next<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Further, <strong>preview<\/strong> the contents of your oversized PST files and select to compress. Hit <strong>Next<\/strong>.\u00a0<\/li>\n<li aria-level=\"1\">Afterward, choose how you want to <strong>compress the PST <\/strong>and use<strong> filters <\/strong>accordingly.\u00a0<\/li>\n<li aria-level=\"1\">Finally, select the <strong>Path to Save<\/strong> your compacted PST and tap <strong>Start Compression.\u00a0<br \/><br \/><\/strong><\/li>\n<\/ol>\n<p>For a complete pictorial walkthrough of the tool, visit the <a href=\"https:\/\/www.sysinfotools.com\/software-guide\/compact-pst-files.html\" target=\"_blank\" rel=\"noopener\"><strong>PST Compress and Compact Tool User Manual<\/strong><\/a>. Learn how to compress and compact PST files in a few simple steps.<\/p>\n<div style=\"background: linear-gradient(135deg, #fafdff, #ddf2ff); border-left: 5px solid #1e4258; border-radius: 12px; padding: 20px 25px; margin: 15px 0px; box-shadow: rgba(0, 0, 0, 0.08) 0px 4px 14px; transition: 0.3s; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; color: #2a2a2a;\">\n<p><strong>Real User Case<\/strong><\/p>\n<p>A client from a mid-sized IT firm came with a query on <em>\u201c<\/em><a href=\"https:\/\/www.sysinfotools.com\/knowledgebase\/how-to-compress-or-shrink-my-large-size-pst-files-used-by-microsoft-outlook.html\" target=\"_blank\" rel=\"noopener\"><strong><em>How to compress or shrink my large size PST files used by Microsoft Outlook<\/em><\/strong><\/a><em>? I am in a hurry and need to ensure that all my PST file sizes are reduced without altering any content.\u201d <\/em>He had already tried the <strong>manual compact<\/strong>, but it didn\u2019t work well. Then, upon receiving the <strong>SysInfo PST Compresser Tool,<\/strong> he was able to reduce the size of around <strong>280+ PST files<\/strong> in one go. Everything was managed smoothly, the interface was very easy to use, and required <strong>no technical expertise <\/strong>or<strong> MS Outlook installation<\/strong>. They were soon able to resume the business operations without halts. <strong>Outlook performance increased<\/strong>, and the<strong> risk of corruption was eliminated,<\/strong> too.\u00a0<\/p>\n<\/div>\n<h4>How to Prevent Oversized PSTs in the Future?<\/h4>\n<ul>\n<li aria-level=\"1\">Keep older emails in separate PST archives regularly.\u00a0<\/li>\n<li aria-level=\"1\">Monitor the growth of PST files and mailbox size at least quarterly.\u00a0<\/li>\n<li aria-level=\"1\">Remove duplicates that consume your storage unnecessarily.\u00a0<\/li>\n<li aria-level=\"1\">Compress PST data files periodically to reuse unused space.\u00a0<\/li>\n<li aria-level=\"1\">Split very large PST files to achieve maximum size thresholds.\u00a0<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Final_Remarks\"><\/span>Final Remarks\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Whether you are an individual, a professional, a business, or an enterprise, it is not very difficult to repair oversized Outlook PST files. The most common issue with PST files exceeding the size limit is MS Outlook corruption, mailbox inaccessibility, and related concerns. You can use the Inbox Repair Tool or PST Repair Tool to fix the corrupted PSTs initially. Once repaired, following the mentioned manual compact and split solutions, you can repair oversized PST. But for efficiency and long-term Outlook stability, it is suggested to use the SysInfo PST Compress and Compact Software.<\/p>\n<h4 class=\"faq_heading\">Frequently Asked Questions<\/h4>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1781342236028\"><strong class=\"schema-faq-question\">Q1. What is the maximum PST file size supported by Outlook?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>The maximum PST file size that Outlook supports is 50 GB for UNICODE PST files. It is supported for PST files created in Outlook 2010 or later versions. If you are using Outlook 2003-2007, then 20 GB UNICODE PSTs are supported, and for Outlook 2002 and earlier versions, 2 GB ANSI PST is the maximum size.\u00a0<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1781342315832\"><strong class=\"schema-faq-question\">Q2. Can I repair multiple oversized PST files at once?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>Yes, you can definitely repair multiple oversized PST files at once with the PST Compress and Compact Tool. If the files are corrupted, it\u2019s best to use the SysInfo PST Recovery Tool.\u00a0<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1781342332698\"><strong class=\"schema-faq-question\">Q3. How do I fix a PST file that exceeds the Outlook size limit?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>If your PST file exceeds the Outlook size limit, then use the Outlook built-in Compact tool, archive old PST files, and increase the file size limit with registry keys. Or, use SysInfo Outlook Compress and Compact Tool for the fix.\u00a0<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1781342364081\"><strong class=\"schema-faq-question\">Q4. What should I do if ScanPST fails to repair my PST file?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>If ScanPST fails to repair your PST file, use the SysInfo PST File Repair Tool. It can handle multiple large PST files, fix them with advanced recovery modes, and save back to PST or another format.\u00a0<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1781342379673\"><strong class=\"schema-faq-question\">Q5. What is the best way to repair oversized Outlook PST files in 2026?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>The best way to repair an oversized Outlook PST in 2026 is by using the Outlook Emails Compress Tool by SysInfo, ensuring all files are in a healthy state for compression.\u00a0<br><\/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;5232&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;Repair Oversized PST Files: Complete Outlook Recovery Guide&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>Outlook PSTs don\u2019t become oversized in one night; instead, they slowly fill up with constant email exchanges. The data accumulated<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":22074,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[532],"tags":[],"class_list":["post-5232","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-file-recovery-repair"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Repair Oversized PST Files: Complete Outlook Recovery Guide<\/title>\n<meta name=\"description\" content=\"Learn how to repair oversized PST files, fix Outlook corruption issues, and restore mailboxes safely with proven recovery solutions in 2026\" \/>\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.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Repair Oversized PST Files: Complete Outlook Recovery Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to repair oversized PST files, fix Outlook corruption issues, and restore mailboxes safely with proven recovery solutions in 2026\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/\" \/>\n<meta property=\"og:site_name\" content=\"SysinfoTools Tech Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/sysinfotools\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-13T09:39:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-31T07:25:33+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.sysinfotools.com\/blog\/wp-content\/uploads\/2026\/06\/repair-oversized-pst.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"698\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Simran Bhatia\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Simran Bhatia\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/\"},\"author\":{\"name\":\"Simran Bhatia\",\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/#\/schema\/person\/0bc86a610ba204e43dcf67ac0c4f422a\"},\"headline\":\"Repair Oversized PST Files: Complete Outlook Recovery Guide\",\"datePublished\":\"2026-06-13T09:39:32+00:00\",\"dateModified\":\"2026-07-31T07:25:33+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/\"},\"wordCount\":1967,\"publisher\":{\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.sysinfotools.com\/blog\/wp-content\/uploads\/2026\/06\/repair-oversized-pst.webp\",\"articleSection\":[\"File Recovery &amp; 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With a background in computer science and a passion for writing, I thrive to deliver complex technical content in simple layman terms.\",\"sameAs\":[\"https:\/\/www.sysinfotools.com\/\",\"https:\/\/www.linkedin.com\/in\/simran-bhatia-190169299\"],\"url\":\"https:\/\/www.sysinfotools.com\/blog\/author\/admin\/\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342236028\",\"position\":1,\"url\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342236028\",\"name\":\"Q1. What is the maximum PST file size supported by Outlook?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\/strong>The maximum PST file size that Outlook supports is 50 GB for UNICODE PST files. It is supported for PST files created in Outlook 2010 or later versions. If you are using Outlook 2003-2007, then 20 GB UNICODE PSTs are supported, and for Outlook 2002 and earlier versions, 2 GB ANSI PST is the maximum size.\u00a0<br>\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342315832\",\"position\":2,\"url\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342315832\",\"name\":\"Q2. Can I repair multiple oversized PST files at once?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\/strong>Yes, you can definitely repair multiple oversized PST files at once with the PST Compress and Compact Tool. If the files are corrupted, it\u2019s best to use the SysInfo PST Recovery Tool.\u00a0<br>\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342332698\",\"position\":3,\"url\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342332698\",\"name\":\"Q3. How do I fix a PST file that exceeds the Outlook size limit?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\/strong>If your PST file exceeds the Outlook size limit, then use the Outlook built-in Compact tool, archive old PST files, and increase the file size limit with registry keys. Or, use SysInfo Outlook Compress and Compact Tool for the fix.\u00a0<br>\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342364081\",\"position\":4,\"url\":\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342364081\",\"name\":\"Q4. What should I do if ScanPST fails to repair my PST file?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\/strong>If ScanPST fails to repair your PST file, use the SysInfo PST File Repair Tool. 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If the files are corrupted, it\u2019s best to use the SysInfo PST Recovery Tool.\u00a0<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342332698","position":3,"url":"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/#faq-question-1781342332698","name":"Q3. How do I fix a PST file that exceeds the Outlook size limit?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>If your PST file exceeds the Outlook size limit, then use the Outlook built-in Compact tool, archive old PST files, and increase the file size limit with registry keys. 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