{"id":3563,"date":"2022-08-05T10:02:59","date_gmt":"2022-08-05T10:02:59","guid":{"rendered":"https:\/\/www.emailsupport.us\/blog\/?p=3563"},"modified":"2022-08-24T12:44:31","modified_gmt":"2022-08-24T12:44:31","slug":"outlook-ost-file-cannot-be-opened","status":"publish","type":"post","link":"https:\/\/www.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/","title":{"rendered":"Troubleshoot Outlook OST File Cannot Be Opened Error"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Outlook users rarely notice any issue with the application. Still, staying updated about the solutions to technical glitches that may occur sometimes is a wise practice. One of the issues relates to an inaccessible Outlook OST file. The Outlook OST file cannot be opened error is often an outcome of upgrading the application or reinstalling it. If you installed an Office update, you might encounter this error. When the OST file cannot be opened, it will render you incapable of working offline. So, there\u2019s a need to fix the glitch causing this issue. In this post, you will read about the reasons and solutions for this specific Outlook problem.<\/span><\/p>\n<blockquote><p><strong>Related Post:- <a target=\"_blank\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-keeps-crashing\/\" rel=\"noopener\">Why Outlook Keeps Crashing<\/a><\/strong><\/p><\/blockquote>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0\u00a0<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 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.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#Why_Outlook_OST_File_Cannot_Be_Opened_Error_Occurs\" >Why Outlook OST File Cannot Be Opened Error Occurs?<\/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.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#Fixes_for_Outlook_OST_File_Not_Opening_Problem\" >Fixes for Outlook OST File Not Opening Problem<\/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.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#1_Use_the_SCANPSTEXE_Tool_to_Repair_the_OST_File\" >1. Use the SCANPST.EXE Tool to Repair the 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.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#2_Recreate_the_OST_File_If_It_cannot_be_Repaired\" >2. Recreate the OST File If It cannot be Repaired<\/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.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#3_Disable_the_Cached_Exchange_Mode\" >3. Disable the Cached Exchange 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.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#4_Repair_MS_Outlook\" >4. Repair MS Outlook<\/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.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#5_Eliminate_Every_Outlook-Related_Process\" >5. Eliminate Every Outlook-Related Process<\/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.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#6_Export_Your_OST_Information_to_a_PST_File\" >6. Export Your OST Information to a PST File<\/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.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#7_Disable_Faulty_Add-ins\" >7. Disable Faulty Add-ins<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-ost-file-cannot-be-opened\/#Final_Words\" >Final Words<\/a><\/li><\/ul><\/nav><\/div>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Why_Outlook_OST_File_Cannot_Be_Opened_Error_Occurs\"><\/span><b>Why Outlook OST File Cannot Be Opened Error Occurs?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The OST file in your Outlook program can malfunction due to many reasons. Here are the major ones that demand your attention.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You have either installed an Office update or need to install an update.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You have made certain customizations to the navigation pane.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The OST file is <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/community.spiceworks.com\/how_to\/167663-how-to-repair-corrupted-ost-file-step-by-step-guide\">corrupt<\/a>.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An error during data synchronization between the Exchange server and .OST files in Outlook cause this problem.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Many users are using the OST file simultaneously.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">There\u2019s a glitch in your Outlook application.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sluggish internet connection\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The cached exchange mode is turned on.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Conflicting Outlook add-ins are also a prominent cause.\u00a0<\/span><\/li>\n<\/ul>\n<blockquote><p><strong>Related Post:- <a target=\"_blank\" href=\"https:\/\/www.emailsupport.us\/blog\/how-to-repair-outlook-pst-files\/\" rel=\"noopener\">How to Repair Outlook PST files<\/a><\/strong><\/p><\/blockquote>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Fixes_for_Outlook_OST_File_Not_Opening_Problem\"><\/span><b>Fixes for Outlook OST File Not Opening Problem<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">You can fix this error through a variety of simple and little advanced measures. Before going ahead, reboot your system, particularly if you have recently installed any Office updates.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_Use_the_SCANPSTEXE_Tool_to_Repair_the_OST_File\"><\/span><b>1. Use the SCANPST.EXE Tool to Repair the OST File<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Damaged or corrupt OST files will prove to be problematic in every situation. You can utilize the in-built SCANPST.EXE tool in Windows to repair it.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Look for the SCANPST tool in your system. It is present in the MS Office installation folder.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Open the tool and find the OST file that requires a repair.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hit \u2018<\/span><b>Start<\/b><span style=\"font-weight: 400;\">\u2019 to scan. After it&#8217;s over, click \u2018<\/span><b>Repair<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After the repair is done, you will notice a message saying, \u2018<\/span><b>Repair Complete<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"2_Recreate_the_OST_File_If_It_cannot_be_Repaired\"><\/span><b>2. Recreate the OST File If It cannot be Repaired<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Sometimes, a deeply corrupt OST file cannot be repaired using the in-built Inbox Repair utility. If this is the problem with you, then you must recreate the OST file in order to troubleshoot Outlook .OST file cannot be opened error.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Remove the OST file from your computer.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To determine the place of the OST file, input \u2018<\/span><b>%LOCALAPPDATA%\\Microsoft\\Outlook\\<\/b><span style=\"font-weight: 400;\">\u2019 in the Search bar.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hit Enter key, and you will find this file.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Now, start Outlook again. The OST file will be made automatically by Outlook. Now you can open it easily.\u00a0<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"3_Disable_the_Cached_Exchange_Mode\"><\/span><b>3. Disable the Cached Exchange Mode<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Disabling the cached exchange mode in Outlook is also a good measure for Outlook OST files cannot be opened in Windows 10. Here is how to turn this mode off.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After closing MS Outlook go to Control Panel.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Search and click \u2018<\/span><b>Mail<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tap the button \u2018<\/span><b>Email Accounts\u2026.<\/b><span style=\"font-weight: 400;\">\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Select the tab \u2018<\/span><b>Email<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tap \u2018<\/span><b>Exchange account<\/b><span style=\"font-weight: 400;\">\u2019 followed by \u2018<\/span><b>Change<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Look below \u2018<\/span><b>Offline Settings<\/b><span style=\"font-weight: 400;\">\u2019 and untick the option \u2018<\/span><b>Use cached Exchange mode<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Select \u2018<\/span><b>Next<\/b><span style=\"font-weight: 400;\">.\u2019 After that, click \u2018<\/span><b>Finish<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You can restart your Outlook now.\u00a0<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"4_Repair_MS_Outlook\"><\/span><b>4. Repair MS Outlook<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">A bug in the Outlook program prevents the OST file from getting opened. When you repair the application, the error will disappear.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To <a target=\"_blank\" href=\"https:\/\/www.emailsupport.us\/blog\/how-to-repair-office-365\/\" rel=\"noopener\"><strong>repair Outlook using Office Repair,<\/strong><\/a> go to the \u2018<\/span><b>Start<\/b><span style=\"font-weight: 400;\">\u2019 area.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Choose \u2018<\/span><b>Apps and Features<\/b><span style=\"font-weight: 400;\">\u00a0on the menu that appears.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Choose Outlook and select \u2018<\/span><b>Modify<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Based on your Office copy, you will find an option to repair the program.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Now just go by the directions on your screen to finish the repair process. You can now open Outlook and not worry about encountering this error message.\u00a0<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"5_Eliminate_Every_Outlook-Related_Process\"><\/span><b>5. Eliminate Every Outlook-Related Process<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Killing Outlook-related processes will also help you troubleshoot the issue that\u2019s preventing the OST file from getting opened. Here is how to kill these processes.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After closing Outlook, right-click the Taskbar.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Choose \u2018<\/span><b>Start Task Manager<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Now opt for the \u2018<\/span><b>Processes<\/b><span style=\"font-weight: 400;\">\u2019 tab.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Look for these processes: &#8216;<\/span><b>Lync, &#8216;Communicator, &#8216;Lync, &#8216;ucmapi<\/b><span style=\"font-weight: 400;\">&#8216; or &#8216;<\/span><b>Outlook<\/b><span style=\"font-weight: 400;\">.&#8217;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Right-tap the processes and hit \u2018<\/span><b>End Process<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"6_Export_Your_OST_Information_to_a_PST_File\"><\/span><b>6. Export Your OST Information to a PST File<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">This fix is especially for Outlook 2010 users. When you encounter the OST file cannot be opened in Outlook problem, and cannot recover the OST file, try exporting the OST data to a PST file. Here are the instructions for it.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hit \u2018<\/span><b>File<\/b><span style=\"font-weight: 400;\">\u2019 in Outlook.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Click \u2018<\/span><b>Open<\/b><span style=\"font-weight: 400;\">\u2019 followed by \u2018<\/span><b>Import<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Choose to import from a different program and hit \u2018<\/span><b>Next<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Now choose Outlook Data File (.pst).\u2019\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After that, click \u2018<\/span><b>Next<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To find the PST file, you have recently imported, hit \u2018<\/span><b>Browse<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Choose \u2018<\/span><b>Do not import duplicates<\/b><span style=\"font-weight: 400;\">.\u2019 Then click \u2018<\/span><b>Next<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Below the tab of \u2018<\/span><b>Select destination folder<\/b><span style=\"font-weight: 400;\">,\u2019 tap a folder where you desire to import the data.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hit \u2018<\/span><b>Next<\/b><span style=\"font-weight: 400;\">\u2019 after doing so.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tap the \u2018<\/span><b>Finish<\/b><span style=\"font-weight: 400;\">\u2019 button.\u00a0<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"7_Disable_Faulty_Add-ins\"><\/span><b>7. Disable Faulty Add-ins<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Many Outlook add-ins are incompatible with the application. They also hinder the OST file from opening properly. So you must disable them to get rid of this error.\u00a0<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Firstly, <a target=\"_blank\" href=\"https:\/\/www.emailsupport.us\/blog\/how-to-open-outlook-in-safe-mode\/\" rel=\"noopener\"><strong>run the Outlook application in safe mode<\/strong><\/a><\/span><span style=\"font-weight: 400;\">. For doing so, open the Windows Start menu. Then enter \u2018<\/span><b>outlook.exe\/safe<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Your Outlook will launch in safe mode without any add-ins.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tap \u2018<\/span><b>File<\/b><span style=\"font-weight: 400;\">\u2019 in the program. After that, head to \u2018<\/span><b>Options<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hit the \u2018<\/span><b>Add-ins<\/b><span style=\"font-weight: 400;\">\u2019 option. You must also check that you have selected \u2018<\/span><b>COM Add-ins<\/b><span style=\"font-weight: 400;\">.\u2019<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Click \u2018<\/span><b>Go<\/b><span style=\"font-weight: 400;\">.\u2019\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Now ensure that you deactivate every add-in.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After deactivating the add-ins, start Outlook normally. It is highly probable that you would not face this error. If you can operate without any glitch, find the add-in that was causing the problem and deactivate it permanently.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You can enable other add-ins that are not causing issues.\u00a0<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Final_Words\"><\/span><b>Final Words<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The Outlook OST file cannot be opened error message can feel annoying primarily because you cannot continue working when offline. Use these effective fixes to eliminate the common causes of this issue. Additionally, ensure that you are operating with a stable internet connection. You can also avail of additional help by contacting expert <strong><a target=\"_blank\" href=\"https:\/\/www.emailsupport.us\/microsoft-outlook-support\" rel=\"noopener\">Outlook support<\/a><\/strong> professionals.\u00a0\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Outlook users rarely notice any issue with the application. Still, staying updated about the solutions to technical glitches that may occur sometimes is a wise practice. One of the issues relates to an inaccessible Outlook OST file. The Outlook OST file cannot be opened error is often an outcome [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3630,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[257],"tags":[1343,1346,1342,1344,1345],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.10 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Outlook OST File Cannot Be Opened | Why &amp; How To Fix?<\/title>\n<meta name=\"description\" content=\"You can encounter Outlook OST file cannot be opened error after upgrading Outlook. Here are effective fixes for it. Repair or recreate the OST file. 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