{"id":979,"date":"2024-01-22T12:34:35","date_gmt":"2024-01-22T12:34:35","guid":{"rendered":"https:\/\/www.datavare.com\/how\/?p=979"},"modified":"2024-01-22T12:34:35","modified_gmt":"2024-01-22T12:34:35","slug":"increase-ost-file-size-in-ms-outlook-2021","status":"publish","type":"post","link":"https:\/\/www.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/","title":{"rendered":"How to Increase OST file Size in MS Outlook 2021 and Earlier Edition?"},"content":{"rendered":"<blockquote>\n<p style=\"margin-top: 0in;\"><em><span lang=\"EN-IN\" style=\"font-size: 13.0pt; font-family: 'open sans',serif; color: #181617;\"><strong>Summary<\/strong>:\u00a0We all know that every file format has limitation of data storage. Sp does with OST file format. An OST file stores contacts, notes, emails, attachments, and many other databases. Oversized OST files can corrupt and impact performance of MS Outlook. <\/span><span lang=\"EN-IN\" style=\"font-size: 13.0pt; font-family: 'open sans',serif; color: #181617;\">The article focuses on safely increasing your OST file size in Outlook 2021, 2019, 2016, 2013, and earlier versions without impacting Outlook performance.<\/span><\/em><\/p>\n<p style=\"text-align: center;\"><em><a class=\"maxbutton-1 maxbutton maxbutton-download-now\" target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.datavare.com\/dl\/n\/osttopstdemo.exe\"><span class='mb-text'>Download Now<\/span><\/a> <\/em><\/p>\n<\/blockquote>\n<p style=\"margin-top: 0in; background: white;\"><span lang=\"EN-IN\" style=\"font-size: 13.0pt; font-family: 'open sans',serif; color: #181617;\">Let\u2019s know about the file size of OST file format. Do you know you can increase the OST file size up to 50GB if you are using Outlook 2021, 2019, 2016, 2013, or 2010. For ANSI version, the limit cannot increase more than 2 GB. In Outlook 2003 and 2007, the limit is 20 GB.<\/span><\/p>\n<p style=\"margin-top: 0in; background: white;\"><span lang=\"EN-IN\" style=\"font-size: 13.0pt; font-family: 'open sans',serif; color: #181617;\">The file limitation is mentioned in the Exchange email account in Outlook. Go to the\u00a0<strong><span style=\"font-family: 'open sans',serif;\">File<\/span><\/strong>\u00a0&gt;\u00a0<strong><span style=\"font-family: 'open sans',serif;\">Info<\/span><\/strong>\u00a0section of your Outlook client to check the information.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-980 size-full\" src=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-1.png\" alt=\"Increase OST file Size-1\" width=\"981\" height=\"604\" srcset=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-1.png 981w, https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-1-300x185.png 300w, https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-1-768x473.png 768w\" sizes=\"auto, (max-width: 981px) 100vw, 981px\" \/><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79 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:\/\/www.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/#Why_Increase_the_OST_File_Size\" >Why Increase the OST File Size?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/#Solutions_to_Increase_the_OST_File_Size_in_Outlook_2021_2019_and_Earlier_Versions\" >Solutions to Increase the OST File Size in Outlook 2021, 2019, and Earlier Versions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/#Method_1_Using_Registry_Editor_to_Increase_the_Size\" >Method 1: Using Registry Editor to Increase the Size<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/#Method_2_Using_Group_Policies_GPO_to_Enhance_the_Size_of_OST_files\" >Method 2: Using Group Policies (GPO) to Enhance the Size of OST files<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/#Issues_with_Oversized_OST_Files\" >Issues with Oversized OST Files<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/#Affect_Outlook_Performance\" >Affect Outlook Performance<\/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.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/#Inaccessible_OST_File\" >Inaccessible OST File<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/#Final_Thoughts\" >Final Thoughts<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Why_Increase_the_OST_File_Size\"><\/span>Why Increase the OST File Size?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Reasons for increasing the OST file size may vary. Here are the most common reasons that provoke users to increase the OST file size:<\/p>\n<p>When you use Outlook with Exchange Server, there are chances to receive the below message when the OST file size reaches to its limit. It asks you to delete the items permanently that you no longer need.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-981 size-full\" src=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-2.png\" alt=\"Increase OST file Size-2\" width=\"701\" height=\"101\" srcset=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-2.png 701w, https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-2-300x43.png 300w\" sizes=\"auto, (max-width: 701px) 100vw, 701px\" \/><\/p>\n<p>In your OST file, there is a folder of \u201cDelete items\u201d. When you delete an OST item, it goes to the delete folder. This means the following items were not deleted permanently. This also means that the OST file size is increasing. In this situation, you can receive the following message. The tool asks you to empty your deleted items folder from Outlook to create more space.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-983 size-full\" src=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-3.jpg\" alt=\"Increase OST file Size-3\" width=\"425\" height=\"282\" srcset=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-3.jpg 425w, https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-3-300x199.jpg 300w\" sizes=\"auto, (max-width: 425px) 100vw, 425px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Solutions_to_Increase_the_OST_File_Size_in_Outlook_2021_2019_and_Earlier_Versions\"><\/span>Solutions to Increase the OST File Size in Outlook 2021, 2019, and Earlier Versions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Do you know you can increase the Unicode OST file size to up to 4096 GB or 4 PB. The file size is not practically recommended.<\/p>\n<p>Here are the methods to follow to increase the size of Unicode OST files of 2003, 2007, 2010, 2013, 2016, 2019, and 2021Outlook versions. These methods only work for Unicode OST files. To learn how to export ANSI and Unicode format you are using, <strong>here are the steps to follow:<\/strong><\/p>\n<ul>\n<li>Access MS Outlook application and go to the\u00a0<strong>File<\/strong>\u00a0menu &gt;\u00a0<strong>Info<\/strong>\u00a0&gt;\u00a0<strong>Account Settings<\/strong>\u00a0&gt;\u00a0<strong>Account Settings<\/strong>\u00a0&gt;\u00a0<strong>Data File.<\/strong><\/li>\n<li>After that, select the <strong>Outlook Data File <\/strong>and then hit the\u00a0<strong>Open File Location<\/strong> tab. A new window will open displaying the OST file.<\/li>\n<li>Right-click on the OST file and select <strong>Properties<\/strong> from the dropdown menu.<\/li>\n<li>Press the\u00a0<strong>Details<\/strong>\u00a0tab and check\u00a0<strong>Type<\/strong>.\n<ul>\n<li>If the Type shows, <strong>Outlook Data File<\/strong>. This means it is the UNICODE format.<\/li>\n<li>If the<strong>\u00a0Type<\/strong>\u00a0shows\u00a0<strong>Personal Folders File (97 \u2013 2002)\u00a0<\/strong>or\u00a0<strong>Outlook Data File (97 \u2013 2002)<\/strong>, it means the following file is ANSI format.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-982 size-full\" src=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-3.png\" alt=\"Increase OST file Size-3\" width=\"363\" height=\"509\" srcset=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-3.png 363w, https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-3-214x300.png 214w\" sizes=\"auto, (max-width: 363px) 100vw, 363px\" \/><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>As you have come to know about the OST file format, the next step you can look forward is to increase the size if the file is Unicode.<\/p>\n<p><em><strong>Also Read This Post &#8211;<\/strong> <a href=\"https:\/\/www.datavare.com\/blog\/resolve-ost-error.html\">To Resolved Outlook OST Errors<\/a><\/em><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Method_1_Using_Registry_Editor_to_Increase_the_Size\"><\/span>Method 1: Using Registry Editor to Increase the Size<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When you install Outlook or similar type of apps on your system, it creates registry keys. You can modify registry keys to modify the Outlook behavior or functions. In the same manner, you can create new registry keys or files with increased size. Here are the steps to follow:<\/p>\n<ul>\n<li>Press the\u00a0<strong>Windows + R<\/strong><strong> keys together<\/strong>, enter\u00a0<strong>Regedit,<\/strong>\u00a0and then the\u00a0<strong>Enter<\/strong>\u00a0tab. It will access the\u00a0<strong>Registry Editor<\/strong>\u00a0window.<\/li>\n<li>The Outlook version you are using, the\u00a0<strong>Registry Editor <\/strong><strong>location may vary. Here are the paths of the location of Registry Editor<\/strong>:\n<ul>\n<li><strong>Outlook 2003:\u00a0<\/strong>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\11.0\\Outlook\\PST<\/li>\n<li><strong>Outlook 2007:\u00a0<\/strong>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\12.0\\Outlook\\PST<\/li>\n<li><strong>Outlook 2010:\u00a0<\/strong>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\Outlook\\PST<\/li>\n<li><strong>Outlook 2013:<\/strong>\u00a0HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\15.0\\Outlook\\PST<\/li>\n<li><strong>Outlook 2016 \/ Outlook 2019 \/ Microsoft 365:\u00a0<\/strong>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\16.0\\Outlook\\PST<\/li>\n<\/ul>\n<\/li>\n<li>The path has PST file at the end. It doesn\u2019t mean that only PST file size will increase It will increase the size of both OST and PST.<\/li>\n<li>After navigating the location, right-click and create two DWORD (32-bit) values:\n<ul>\n<li><strong>WarnLargeFileSize<\/strong>\u00a0with value\u00a0<strong>4090445042.<\/strong><\/li>\n<li><strong>MaxLargeFileSzie\u00a0<\/strong>with value\u00a0<strong>4294967295.<\/strong><\/li>\n<li>You can enter the values manually to increase the file size to up to\u00a0<strong>100 GB<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-984 size-full\" src=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-4.png\" alt=\"Increase OST file Size-4\" width=\"500\" height=\"318\" srcset=\"https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-4.png 500w, https:\/\/www.datavare.com\/how\/wp-content\/uploads\/2024\/01\/Increase-OST-file-Size-4-300x191.png 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<ul>\n<li>Now save the changes, and restart the system to the see the changes.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Method_2_Using_Group_Policies_GPO_to_Enhance_the_Size_of_OST_files\"><\/span>Method 2: Using Group Policies (GPO) to Enhance the Size of OST files<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This method can be performed by only Exchange Administrators and it is advanced. Here are the steps to increase the OST file size via Group Policies:<\/p>\n<ul>\n<li>Ensure that ADMX\/ADML Administrative template files you can install on the server because it is essential to set Group Policies for Outlook and other Microsoft applications.<\/li>\n<li>Now, press the\u00a0<strong>User Configuration, <\/strong><strong>then<\/strong><strong> Administrative Templates &gt; Microsoft Outlook [version] &gt; Miscellaneous &gt; PST Settings<\/strong>.<\/li>\n<li>At the location, make the given changes-\n<ul>\n<li>Set\u00a0<strong>Large PST<\/strong>:\u00a0<strong>Absolute maximum size.\u00a0<\/strong>And enter value\u00a0<strong>4294967295\u00a0<\/strong>or lower.<\/li>\n<li>Set\u00a0<strong>Large PST: Size to disable adding new content\u00a0<\/strong>to 4090445042 or lower values. Make sure the file size is a bit smaller than the <strong>largest PST file size <\/strong><strong>for its performance<\/strong><strong>.<\/strong><\/li>\n<\/ul>\n<\/li>\n<li>After this step, restart MS Outlook to see the changes you have made. It would take a little to reflect the changes.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Issues_with_Oversized_OST_Files\"><\/span>Issues with Oversized OST Files<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The best practice to use an OST file is that keeps the file size in limit. A large <a href=\"https:\/\/www.datavare.com\/blog\/repair-outlook-ost-file-using-scanost-exe.html\">OST file can corrupt<\/a> and become inaccessible. OST or Offline Storage Table files can hold emails, contacts, notes, journals, and a range of databases. They are prone to corruption.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Affect_Outlook_Performance\"><\/span>Affect Outlook Performance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A large OST file can bring a host of problems. You may encounter performance issues with MS Outlook. Some of them are slow loading of Outlook, delay in sending or receiving emails and sync errors, etc.<\/p>\n<p>You may encounter search related issues. The search box may not provide accurate results or Outlook can hang. If you notice these problems, it is good to decrease the OST file by compressing it or archiving databases. Another thing is to upgrade your system hardware with more RAM and \u00a0a better processor. Microsoft suggests the standard size of OST files is below 20 GB for consistency and avoiding Outlook issues.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Inaccessible_OST_File\"><\/span>Inaccessible OST File<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Do you know that an increased OST file is in the verge of losing quality. OST files can become inaccessible.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Final_Thoughts\"><\/span>Final Thoughts<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>OST files are common files of Outlook. When users use Outlook with Exchange Server, OST files hold properties of Outlook offline. These files let you work offline and don\u2019t affect the work flow because of poor server issues. Therefore, OST is a popular file format. Experts recommend keeping the OST file size up to 25GB to avoid errors. Instead of increasing the OST file size, it is good to archive unnecessary databases locally in PST file format.\u00a0 If you have corrupted OST files that cannot be fixed, it is good to use<a href=\"https:\/\/www.datavare.com\/software\/ost-to-pst-converter-expert.html\"> OST To PST Converter<\/a><strong>, <\/strong>a professional OST converter can export OST to PST within a few clicks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Summary:\u00a0We all know that every file format has limitation of data storage. Sp does with OST file format. An OST file stores contacts, notes, emails, attachments, and many other databases. Oversized OST files can corrupt and impact performance of MS Outlook. The article focuses on safely increasing your OST file size in Outlook 2021, 2019,&#8230;<\/p>\n<p class=\"more-link-wrap\"><a href=\"https:\/\/www.datavare.com\/how\/increase-ost-file-size-in-ms-outlook-2021\/\" class=\"more-link\">Read More<span class=\"screen-reader-text\"> &ldquo;How to Increase OST file Size in MS Outlook 2021 and Earlier Edition?&rdquo;<\/span> &raquo;<\/a><\/p>\n","protected":false},"author":5,"featured_media":986,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-979","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ost-converter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Increase OST file Size in MS Outlook 2021 and Earlier Edition<\/title>\n<meta name=\"description\" content=\"Learn this post to knows the 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