{"id":8974,"date":"2020-01-18T09:52:03","date_gmt":"2020-01-18T09:52:03","guid":{"rendered":"https:\/\/www.sysinfotools.com\/blog\/?p=8974"},"modified":"2025-12-04T07:44:33","modified_gmt":"2025-12-04T07:44:33","slug":"ost-file-not-recognized-by-outlook","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/ost-file-not-recognized-by-outlook\/","title":{"rendered":"OST File Not Recognized by Outlook? Here&#8217;s How to Fix It"},"content":{"rendered":"<div class=\"block_sum\">\n<p><strong>Summary:<\/strong> MS Outlook is often prone to errors and corruption. Similarly, many users encounter the most common error of MS Outlook i.e. \u201cOST File Not Recognized by Outlook\u201d. If you have also experienced it, we have got you covered. This can be generally caused due OST file corruption. Read this blog to know the reason for this error, different solutions, and an expert <a href=\"https:\/\/www.sysinfotools.com\/ost-to-pst-converter.php\"><strong>OST to PST Converter<\/strong><\/a>.<\/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-OST-to-PST-Converter-Demo.exe\"><i class=\"icon-windows\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/ost-to-pst-converter.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\/Sysinfo-Mac-OST-to-PST-for-Mac.dmg\"><i class=\"icon-apple\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/mac\/ost-to-pst-converter\/buy.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>Let\u2019s take it from the core, MS Outlook is one of the most popular email client preferred by various organizations as a medium of communication. The Outlook has always been users\u2019 first choice because of its smart and proactive features. MS Outlook can be work with Exchange Server and SharePoint Server, when it collaborate with Exchange server it creates OST files.<\/p>\n<p>OST file is an offline folder and makes it possible for us to work in offline mode or in slow internet connectivity. Later, once the connection with Exchange server establishes, this OST file is automatically<br \/>\nupdated in the user\u2019s Exchange account. But sometimes this OST files may get corrupted and throws unexpected errors like \u201cOST File Not Recognized by<br \/>\nOutlook\u201d.<\/p>\n<p>In such conditions, users get panic to find the proper solution as this error can cause to the data loss. But, before checking for the solution let\u2019s see the real cause of this error.<\/p>\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-not-recognized-by-outlook\/#Causes_of_OST_File_Error\" >Causes of OST File 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\/ost-file-not-recognized-by-outlook\/#Manual_Solution_to_Fix_Outlook_does_not_Recognize_OST_File_Error\" >Manual Solution to Fix Outlook does not Recognize OST File 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\/ost-file-not-recognized-by-outlook\/#Method_1_%E2%80%93_Recreate_OST_File\" >Method 1 \u2013 Recreate OST File<\/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\/ost-file-not-recognized-by-outlook\/#Method_2_%E2%80%93_Inbox_Repair_Utility\" >Method 2 \u2013 Inbox Repair Utility<\/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-not-recognized-by-outlook\/#Method_3_%E2%80%93_Expert_Choice_to_Solve_Error_OST_File_Not_Recognized_by_Outlook\" >Method 3 \u2013 Expert Choice to Solve Error OST File Not Recognized by Outlook<\/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-not-recognized-by-outlook\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Causes_of_OST_File_Error\"><\/span>Causes of OST File Error<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>OST File Corruption \u2013 <\/strong>OST files are prone to corruption that\u2019s why it can be corrupted due to any reasons like virus attack, reaching to the file size limitation etc. thus leads to this abnormal error.<\/p>\n<p><strong>OST File Synchronization \u2013 <\/strong>if your OST files unable to synchronize with Exchange<br \/>\nserver due to any reason then Outlook report this error.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Manual_Solution_to_Fix_Outlook_does_not_Recognize_OST_File_Error\"><\/span>Manual Solution to Fix Outlook does not Recognize OST File Error<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Manual methods to solve Outlook does not recognize OST file error.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_1_%E2%80%93_Recreate_OST_File\"><\/span>Method 1 \u2013 Recreate OST File<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Following these steps you can create the OST file of any email account.<\/p>\n<ol>\n<li>Go to <strong>Control Panel<\/strong> and click on the <strong>Mail<\/strong> button.<\/li>\n<li>In <strong>Mail Setup<\/strong>, click on\u00a0<strong>Show Profiles<\/strong>, select your profile and choose <strong>Properties<\/strong>.<\/li>\n<li>On E-mail tab select <strong>Exchange account<\/strong>, click on the <strong>Change<\/strong> button and enable <strong>Use Cached Exchange Mode<\/strong>.<\/li>\n<li>Go to <strong>More Settings<\/strong>. In the <strong>Advanced<\/strong> tab, choose <strong>Offline Folder File Settings<\/strong>.<\/li>\n<li>Now choose<strong> Disable Offline Use<\/strong> option and then, click on \u201c<strong>Yes<\/strong>\u201d button.<\/li>\n<li>Go to Offline Folder File Settings, select <strong>OK<\/strong> and <strong>Yes button<\/strong>.<\/li>\n<li>Now choose the checkbox <strong>Use Cached Exchange Mode<\/strong>.<\/li>\n<li>Click on the <strong>OK<\/strong> button, go <strong>Next<\/strong> and <strong>Finish<\/strong>.<\/li>\n<li>Close the <strong>Account Settings<\/strong> and<strong> Mail Setup<\/strong> wizard.<\/li>\n<\/ol>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_2_%E2%80%93_Inbox_Repair_Utility\"><\/span>Method 2 \u2013 Inbox Repair Utility<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Inbox repair utility is the inbuilt tool of MS Outlook to diagnose the issue, now follow these methods to fix the OST file is not recognized by Outlook error.<\/p>\n<ol>\n<li>Launch the inbox repair utility<\/li>\n<li>Click on the <strong>Browse <\/strong>button to select the OST file<\/li>\n<li>Press the <strong>Start button<\/strong> and <strong>scanning<\/strong> process will start<\/li>\n<li>After the scanning it will generate a list of errors. Then, <strong>choose the Repair<\/strong> button<\/li>\n<li>Now <strong>restart Outlook<\/strong> and check if the OST file works or not.<\/li>\n<\/ol>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_3_%E2%80%93_Expert_Choice_to_Solve_Error_OST_File_Not_Recognized_by_Outlook\"><\/span>Method 3 \u2013 Expert Choice to Solve Error OST File Not Recognized by Outlook<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>After implementing above two methods, still you are unable to access OST file and getting the same error message of Outlook does not recognized OST file, then you must go for professional approach. As mention above two methods are not sure shot solution to solve this OST file error, so we suggest you to try <strong>OST to PST Converter<\/strong>. This software is exclusively designed to <strong><a href=\"https:\/\/www.sysinfotools.com\/blog\/convert-ost-file-to-pst\/\">convert OST files into PST<\/a><\/strong> format along with all the email items. Also this program will repair your damaged OST file with in second and let you access all the important emails, contacts, calendar etc. This handy converter is compatible with all the versions of Windows 10 and MS Outlook 2019, 2016, 2013, 2010 etc. Also, it allows to <a href=\"https:\/\/www.sysinfotools.com\/blog\/import-ost-to-outook\/\"><strong>import OST file to Outlook<\/strong><\/a> and many email clients.<\/p>\n<p>Follow the steps to fix OST file Not Recognize Error<\/p>\n<ol>\n<li>Launch the OST to PST Converter; select the corrupted OST file by clicking on browse button.<\/li>\n<li>Choose the scanning option (Standard, Advance, &amp; Deep) click ok button.<\/li>\n<li>Once the scanning is done<strong>, check the<\/strong> <strong>preview<\/strong>.<\/li>\n<li>Choose the folder and <strong>click on save<\/strong> button.<\/li>\n<li>As you click on <strong>save button<\/strong> conversion gets started.<\/li>\n<li>Now <strong>import this converted PST<\/strong> file in your outlook and check your emails.<\/li>\n<\/ol>\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>Now you know your answer what to do if OST file does not recognized error prompt in your computer screen. The most common reason of any Outlook error is the file corruption and it can be happen anytime without your knowledge. Hence it is always requested to manage your data files very carefully as these are filled with loads of vital information. We have talked about all the possible solutions (manual or automated) to resolve this issue. If you want to know about<a href=\"https:\/\/www.sysinfotools.com\/blog\/best-ost-to-pst-converter-tools\/\"> top 3 OST to PST Converter <\/a>then read here. You can opt any of them. Hope you like this article! Please share your views in the comment section.<\/p>\n<p><strong>Read Also:<\/strong> <a href=\"https:\/\/www.sysinfotools.com\/blog\/import-ost-to-imap\/\">Import OST to IMAP<\/a><\/p>\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;8974&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 Not Recognized by Outlook? 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Similarly, many users encounter the most common error of MS<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/ost-file-not-recognized-by-outlook\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":8975,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1588],"tags":[],"class_list":["post-8974","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 Not Recognized by Outlook? Here&#039;s How to Fix It<\/title>\n<meta name=\"description\" content=\"Unable to access OST file? 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