{"id":1330,"date":"2025-07-10T06:53:04","date_gmt":"2025-07-10T06:53:04","guid":{"rendered":"https:\/\/www.datavare.com\/how\/?p=1330"},"modified":"2025-07-10T06:53:04","modified_gmt":"2025-07-10T06:53:04","slug":"fix-outlook-ost-file-inaccessible-error-due-to-configuration","status":"publish","type":"post","link":"https:\/\/www.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/","title":{"rendered":"How to Fix Outlook OST File Inaccessible Error Due to Configuration Issues"},"content":{"rendered":"<p><strong>Summary<\/strong>: \u201cFix Outlook OST file inaccessible because they have been configured.\u201d This is one of the most annoying conditions that MS Outlook for Windows users face. When Outlook synchronizes with MS Exchange Server, it saves data locally in the OST file extension. Several reasons for the inaccessible OST could explain why it has been configured. We will investigate the reasons behind this issue.<\/p>\n<p>OST or Offline Storage Table holds a copy of the Exchange data offline, allowing users to work offline. An OST file can store emails, contacts, notes, addresses, and events.<\/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\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Reasons_for_Inaccessible_OST_Files\" >Reasons for Inaccessible 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-2\" href=\"https:\/\/www.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#The_Following_Messages_Appear_When_OST_cannot_Be_Accessed\" >The Following Messages Appear When OST cannot Be Accessed<\/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.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Solutions_to_Fix_Outlook_OST_File_Cannot_Be_Accessed_Configured_Different_Mailbox\" >Solutions to Fix Outlook OST File Cannot Be Accessed, Configured Different Mailbox<\/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.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Solution_1_Restarting_Reconnecting_Outlook\" >Solution 1. Restarting &amp; Reconnecting Outlook<\/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.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Solution_2_Access_Outlook_in_Safe_Mode\" >Solution 2. Access Outlook in Safe Mode<\/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.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Solution_3_Restore_or_Fix_Outlook_OST_File\" >Solution 3. Restore or Fix Outlook OST File<\/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\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Solution_4_Remove_Extra_Add-ons\" >Solution 4. Remove Extra Add-ons<\/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.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Solution_5_Creating_a_New_Outlook_Profile\" >Solution 5. Creating a New Outlook Profile<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Solution_6_Deleting_the_Existing_Outlook_OST_File\" >Solution 6. Deleting the Existing Outlook OST File<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Solution_7_Analyse_Fix_Hard_Drive_Errors\" >Solution 7. Analyse &amp; Fix Hard Drive Errors<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Conversion_of_OST_into_PST_to_Fix_Outlook_OST_File\" >Conversion of OST into PST to Fix Outlook OST File<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Prominent_Features_of_OST_to_PST_Converter\" >Prominent Features of OST to PST Converter<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Reasons_for_Inaccessible_OST_Files\"><\/span>Reasons for Inaccessible OST Files<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Disk errors, software errors, damaged OST files, or improper shutdown could be reasons for inaccessible OST files.<\/li>\n<li>If your Outlook profile is corrupted, it could make the OST file inaccessible because Outlook is unable to locate the file, leading to startup failure.<\/li>\n<li>The link between Outlook and servers is incomplete, like Exchange or IMAP, preventing you from accessing the Offline Storage Table.<\/li>\n<li>If Outlook crashes or you shut it down during syncing, you may not be able to access the OST file next time.<\/li>\n<li>There may be an antivirus issue.<\/li>\n<li>Bad sectors or file systems corrupted on the hard drive can make OST files unreadable.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"The_Following_Messages_Appear_When_OST_cannot_Be_Accessed\"><\/span>The Following Messages Appear When OST cannot Be Accessed<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>Cannot start Microsoft Outlook. OST cannot be accessed<\/strong>: The following message appears when the OST file is damaged or issues with a user profile.<\/li>\n<li><strong>Cannot open your default email folders. Outlook is using an old copy of your OST file<\/strong>: The message shows Outlook is trying to access the outdated OST file.<\/li>\n<li><strong>The file location of your Offline Data File (.OST) is invalid<\/strong>: The error message is related to a profile path error, deleted OST file.<\/li>\n<li><strong>Errors have been detected in the file xxx.OST<\/strong>: The following message is the result of Outlook exploring corruption or prompting you to run the ScanPST tool.<\/li>\n<li><strong>OST is in use and cannot be accessed<\/strong>: The following message shows Outlook is already running in the background, or the file may be interrupted by the antivirus.<\/li>\n<li><strong>Your mailbox has been temporarily moved to Microsoft Exchange Server<\/strong>: The message appears when the OST file fails to sync with the Server.<\/li>\n<\/ul>\n<p>Also Read: <a href=\"https:\/\/www.datavare.com\/how\/fix-sync-issues-in-ms-outlook\/\">Fix Sync Issues in MS Outlook<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Solutions_to_Fix_Outlook_OST_File_Cannot_Be_Accessed_Configured_Different_Mailbox\"><\/span>Solutions to Fix Outlook OST File Cannot Be Accessed, Configured Different Mailbox<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The error indicating that OST files cannot be accessed appears particularly when a different mailbox is configured with Outlook. We suggest that you apply any of these solutions to fix the error.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Solution_1_Restarting_Reconnecting_Outlook\"><\/span>Solution 1. Restarting &amp; Reconnecting Outlook<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>It is the foremost step you can take to fix the error.<\/li>\n<li>Turn off Outlook and your system, and then restart them.<\/li>\n<li>It will refresh the tool and might fix temporary issues with the OST file.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Solution_2_Access_Outlook_in_Safe_Mode\"><\/span>Solution 2. Access Outlook in Safe Mode<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Press <strong>Win+R<\/strong> and enter the \u201c<strong>Outlook.exe\/safe<\/strong>\u201d path.<\/li>\n<li>Finally, Press Enter<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Solution_3_Restore_or_Fix_Outlook_OST_File\"><\/span>Solution 3. Restore or Fix Outlook OST File<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Copy and paste the link. <strong><em>C:\\Programs(x86)\\Microsoft Office\/root\/office version\/scanpst.exe<\/em><\/strong>(depends on your Outlook version).<\/li>\n<li>Tap twice to run the repairing <strong>SCANPST.exe<\/strong> tool.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Solution_4_Remove_Extra_Add-ons\"><\/span>Solution 4. Remove Extra Add-ons<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Launch Outlook and go to \u201c<strong>File&gt;&gt;Options<\/strong>\u201d<\/li>\n<li>Choose Add-ons and then hit Go Next to <strong>manage:COM Add-ins<\/strong>.<\/li>\n<li>Uncheck all unnecessary add-ons and press <strong>OK<\/strong>.<\/li>\n<li>Restart Outlook to see whether the OST file is accessible.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Solution_5_Creating_a_New_Outlook_Profile\"><\/span>Solution 5. Creating a New Outlook Profile<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Go to <strong>Control Panel<\/strong> and select Mail.<\/li>\n<li>Click <strong>Show Profiles<\/strong> and then <strong>Add<\/strong>.<\/li>\n<li>Give a name to the <strong>new profile<\/strong> and connect it to your email account.<\/li>\n<li>Check it as your default profile.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Solution_6_Deleting_the_Existing_Outlook_OST_File\"><\/span>Solution 6. Deleting the Existing Outlook OST File<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Turn off Outlook<\/li>\n<li>Then, go to the <em><strong>C:\\Users\\YourName\\AppData\\Local\\Microsoft Outlook<\/strong><\/em><\/li>\n<li>Locate the existing OST file and delete it<\/li>\n<li>As you access Outlook, it will automatically build a new OST file.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Solution_7_Analyse_Fix_Hard_Drive_Errors\"><\/span>Solution 7. Analyse &amp; Fix Hard Drive Errors<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Click the <strong>Windows key<\/strong>.<\/li>\n<li>Enter <strong>CMD<\/strong>, right click on the <strong>command prompt<\/strong>, and choose <strong>Run as Administrator<\/strong>.<\/li>\n<li>Now type chkdsk <strong>C:\/f<\/strong> and press <strong>Enter<\/strong>.<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"Conversion_of_OST_into_PST_to_Fix_Outlook_OST_File\"><\/span>Conversion of OST into PST to Fix Outlook OST File<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This is the final solution we recommend you use if the above solutions fail to fix the inaccessible OST file error. For this, we recommend that you use the <strong>DataVare <a href=\"https:\/\/www.datavare.com\/software\/ost-to-pst-converter-expert.html\">OST to PST Converter<\/a> Expert<\/strong>. This is one of the most advanced applications for the conversion of OST to PST in no time. The application enables the conversion of single or multiple OST files.<\/p>\n<p style=\"text-align: center\"><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>\u00a0 <a class=\"maxbutton-2 maxbutton maxbutton-buy-now\" target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.datavare.com\/software\/order\/ost-to-pst-expert.html\"><span class='mb-text'>Buy Now<\/span><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Prominent_Features_of_OST_to_PST_Converter\"><\/span>Prominent Features of OST to PST Converter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>The tool is self-explanatory, needs basic technical skills to run on your system.<\/li>\n<li>The application allows conversion of single and multiple OST files to PST. Hence, it saves time and effort.<\/li>\n<li>The conversion process takes a maximum of five major steps to provide hassle hassle-free conversion.<\/li>\n<li>Retaining the quality of OST files ensures the quality of OST databases, including emails, attachments, contacts, events, etc.<\/li>\n<li>A free trial is available to download and run to evaluate the performance of the app.<\/li>\n<li>The licensed version is valid for an unlimited duration to export unlimited OST files to PST.<\/li>\n<li>It is compatible with all Outlook versions.<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>OST files are prone to corruption. The best practice is to export OST into PST to store data offline without hassles. We hope that the above solutions seem worthy for you to apply successfully to fix OST is inaccessible because it has been configured.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Summary: \u201cFix Outlook OST file inaccessible because they have been configured.\u201d This is one of the most annoying conditions that MS Outlook for Windows users face. When Outlook synchronizes with MS Exchange Server, it saves data locally in the OST file extension. Several reasons for the inaccessible OST could explain why it has been configured&#8230;.<\/p>\n<p class=\"more-link-wrap\"><a href=\"https:\/\/www.datavare.com\/how\/fix-outlook-ost-file-inaccessible-error-due-to-configuration\/\" class=\"more-link\">Read More<span class=\"screen-reader-text\"> &ldquo;How to Fix Outlook OST File Inaccessible Error Due to Configuration Issues&rdquo;<\/span> &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":1334,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1330","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>Fix Outlook OST File Inaccessible Error Due to Configuration Issue<\/title>\n<meta name=\"description\" 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