{"id":7336,"date":"2019-08-08T12:57:32","date_gmt":"2019-08-08T12:57:32","guid":{"rendered":"https:\/\/www.sysinfotools.com\/blog\/?p=7336"},"modified":"2024-12-30T11:13:25","modified_gmt":"2024-12-30T11:13:25","slug":"outlook-ost-has-reached-maximum-size-error","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/outlook-ost-has-reached-maximum-size-error\/","title":{"rendered":"Warning- Outlook OST has Reached Maximum Size in Outlook 2016 and 2010."},"content":{"rendered":"<div class=\"block_sum\"><strong>Summary:-<\/strong> All the cached data of MS Outlook is stored in an OST file format on the local machine but sometimes due to the deficiency in storage space on the Outlook server, the OST files exceeds its size limit and the warning appears. Due to this problem the user frequently encounters Outlook OST has reached maximum size error. In this blog, I\u2019ll discuss the various reasons why this warning appears and also cover all the techniques as well as the best <a href=\"https:\/\/www.sysinfotools.com\/recovery\/ost-file-recovery.php\"><strong>OST Recovery Tool<\/strong><\/a> that would help you in resolving this warning.<p class=\"blog-btn\"><a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfoTools-OST-recovery.exe\"><i class=\"icon-windows\"><\/i>  Download<\/a>   <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/ost-recovery.php\"><i class=\"icon icon-basket\"><\/i>  Buy Now<\/a><\/p><\/div>\r\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\/outlook-ost-has-reached-maximum-size-error\/#Factors_Responsible_for_this_Error\" >Factors Responsible for this Error<\/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.sysinfotools.com\/blog\/outlook-ost-has-reached-maximum-size-error\/#Steps_to_Fix_Outlook_OST_has_Reached_Maximum_Size_Error\" >Steps to Fix Outlook OST has Reached Maximum Size Error<\/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.sysinfotools.com\/blog\/outlook-ost-has-reached-maximum-size-error\/#Know_Your_OST_File_Type_to_Fix_the_Error\" >Know Your OST File Type to Fix the Error<\/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.sysinfotools.com\/blog\/outlook-ost-has-reached-maximum-size-error\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Factors_Responsible_for_this_Error\"><\/span>Factors Responsible for this Error<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<!-- \/wp:post-content -->\r\n\r\n<!-- wp:list -->\r\n<ul><li>When an ANSI PST file exceeds the limit of 2 GB\r\nthen the user faces this error.<\/li><li>Sometimes the Unicode PST file reaches its\r\nmaximum limit of 50 GB then this warning appears.<\/li><li>Some registry policy might be conflicting OST\r\nfile from increasing the size limit and leading to the warning.<\/li><\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:heading {\"className\":\"h2_bg\"} -->\r\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Steps_to_Fix_Outlook_OST_has_Reached_Maximum_Size_Error\"><\/span>Steps to Fix Outlook OST has Reached Maximum Size Error<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>Well, it is a quite lengthy process to fix this error and it\r\nincludes three major steps. Let\u2019s see how we can prevent this warning from occurring\r\nagain and again.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3,\"className\":\"h3_bg\"} -->\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Know_Your_OST_File_Type_to_Fix_the_Error\"><\/span>Know Your OST File Typ<\/strong>e to Fix the Error<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>First of all, you must determine the type of file whether it\r\nis Unicode or ANSI.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list -->\r\n<ul><li>Go to <strong>Start<\/strong>\r\nand then Open <strong>Control Panel<\/strong>.<\/li><li>Open <strong>Mails<\/strong>\r\nand Click on <strong>Data Files<\/strong>.<\/li><li>Open the <strong>OST<\/strong>\r\nfile which is having the issue.<\/li><li>Click on the <strong>Advanced<\/strong> Tab and see the Message at the Bottom.<\/li><li><strong>Mailbox\r\nMode<\/strong> will tell whether the file is Unicode or ANSI.<\/li><\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>Now, you have determined the type of OST file you are\r\nhaving. So if you are having ANSI OST file then create some space on it and\r\nreduce its size to less than 2 GB. Then these techniques will surely resolve\r\nOST has reached Maximum Size Error.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>If you don\u2019t want to delete items from the OST file then the\r\nonly way left is to locate OST file and convert it ANSI OST to Unicode OST.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":4} -->\r\n<h4 class=\"wp-block-heading\">Locate OST File<\/h4>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:list -->\r\n<ul><li>If you are using Windows Vista or 7 then just\r\nfollow the path given below:-<\/li><\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:paragraph -->\r\n<p><strong>C:\\Users\\-your-username-here\\AppData\\Local\\Microsoft\\Outlook\\<\/strong><\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list -->\r\n<ul><li>If you are using Windows 2000 or XP then follow\r\nanother path given below:-<\/li><\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:paragraph -->\r\n<p><strong>C:\\Documents and\r\nSettings\\-your-username-here\\Local Settings\\Application Data\\Microsoft\\Outlook\\<\/strong><\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>Note-* You\u2019ll find the OST file at the location only when the exchange server connected to MS Outlook.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":4} -->\r\n<h4><strong>Convert ANSI OST to Unicode PS<\/strong>T<\/h4>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>Once you have located the OST file now you should follow the steps given below to convert ANSI format to Unicode.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list -->\r\n<ul><li>Disable the Cached Exchange Mode Settings.<\/li><li>Click on OST and Press F2 to rename the Extension from .ost to .old.<\/li><li>Now, Open MS Outlook and then Enable the Cached Exchange Mode Settings.<\/li><li>Close the Outlook application and go to the Location where OST files are saved.<\/li><\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>I hope you have found a new database of OST file on the same location and now you can check the file, it would be surely a Unicode OST file. <\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>Now, the maximum size limit of your cached data has been increased to 50 GB and you\u2019ll not face Outlook OST has reached maximum size error. Here are <a href=\"https:\/\/www.sysinfotools.com\/blog\/restore-data-from-an-orphaned-ost-file\/\">Methods to Restore Data From An Orphaned OST File<\/a><\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":4} -->\r\n<h4 class=\"wp-block-heading\">Convert OST to PST<\/h4>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>This is the most appropriate option for you that first, you should convert OST files to PST and then split it into several PST files. This will maintain all your data intact and prevent data loss. If you are thinking that you have to buy two separate tools for doing so then you are wrong because there is an option of <strong>OST Recovery Software<\/strong>.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list -->\r\n<ul><li>Recovers Data from Large Inaccessible Files.<\/li><li>Converts OST files to PST.<\/li><li>Splits the Resultant PST Files into Multiple Files.<\/li><\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>This software possesses the feature of three different tools\r\ninto one tool. You can try this shortcut as well to fix the OST maximum size\r\nissue.<\/p>\r\n<p>Know: How to <a href=\"https:\/\/www.sysinfotools.com\/how-to\/reduce-ost-file-size.html\"><strong>reduce the OST file size<\/strong><\/a> easily<\/p>\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>So the ball is totally in your court. I have given you three\r\ndifferent solutions to deal with the issue. Creating space by deleting emails\r\ncan resolve this error or increasing the capacity can prevent warnings. Last\r\nbut not least, the OST Recovery Software which is the compilation of many\r\nfeatures. So you can decide which method you want to opt and stop this error\r\nfrom occurring in the future.<\/p>\r\n<!-- \/wp:paragraph -->\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;7336&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;Warning- Outlook OST has Reached Maximum Size in Outlook 2016 and 2010.&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>Summary:- All the cached data of MS Outlook is stored in an OST file format on the local machine but<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/outlook-ost-has-reached-maximum-size-error\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":7356,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[528],"tags":[],"class_list":["post-7336","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mail-management"],"yoast_head":"<!-- This site is optimized with the Yoast SEO 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