{"id":6154,"date":"2019-02-28T08:44:59","date_gmt":"2019-02-28T08:44:59","guid":{"rendered":"https:\/\/www.sysinfotools.com\/blog\/?p=6154"},"modified":"2025-01-09T09:21:01","modified_gmt":"2025-01-09T09:21:01","slug":"fix-ost-is-in-use-and-cannot-be-accessed-outlook","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/","title":{"rendered":"Solve Error: Ost is in Use and Cannot be Accessed in Outlook"},"content":{"rendered":"<div class=\"block_sum\"><strong>Summary:-<\/strong> An OST file is saved on the system i.e. the exact copy of users&#8217; mailboxes on the Exchange server. These files are vulnerable to face issues or errors such as &lsquo;ost is in use and cannot be accessed&rsquo;. Here in this article, we will discuss how to deal with these issues. We will learn about manual solutions and an <a href=\"https:\/\/www.sysinfotools.com\/recovery\/ost-file-recovery.php\"><strong>OST Recovery Tool<\/strong><\/a> to quickly resolve this issue..<\/p>\n<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>\n<\/div>\n<p>Whenever Microsoft Exchange is in Cached Mode on, a replica of the mailboxes from the server gets created and is saved on the system as .ost. We can continue working with the mails even if the connectivity is broken with Exchange server.<\/p>\n<p>There can be various problems that cause OST corruption problems due to which you could face error \u201cthe file is in use and cannot be accessed\u201d.<\/p>\n<p><em>Let&#8217;s move on and learn the cause of the error<\/em><\/p>\n<ul>\n<li>Issues with Synchronization between OST and Exchange Server.<\/li>\n<li>Some conflict with Microsoft Outlook.<\/li>\n<li>Try to access the same ost by multiple users.<\/li>\n<li>Unreliable network connectivity or Slow Internet connection<\/li>\n<li>Unapproved access to the OST file<\/li>\n<li>Outlook process like Office Communicator 2005\/2007, LYNC, and etc. running in the background.<\/li>\n<\/ul>\n<p>You may also like to read:\u00a0<a href=\"https:\/\/www.sysinfotools.com\/solve-error\/outlook-inbox-showing-unread-messages.html\">Outlook Inbox Showing Unread Messages But None Exist<\/a><\/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\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/#Methods_to_Fix_%E2%80%9Cost_is_in_use_and_cannot_be_accessed%E2%80%9D\" >Methods to Fix &#8220;ost is in use and cannot be accessed&#8221;<\/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.sysinfotools.com\/blog\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/#Method_1_Close_All_Outlook_Related_Processes\" >Method 1: Close All Outlook Related Processes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.sysinfotools.com\/blog\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/#Method_2_Disable_Cached_Exchange_Mode\" >Method 2: Disable Cached Exchange Mode<\/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\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/#Method_3_Disable_Outlook_Add-ins\" >Method 3: Disable Outlook Add-ins<\/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\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/#Method_4_Run_Scanostexe_Application\" >Method 4: Run Scanost.exe Application<\/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\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/#Method_5_Repair_OST_file_with_Professional_Software\" >Method 5: Repair OST file with Professional Software<\/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.sysinfotools.com\/blog\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/#Final_words\" >Final words<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Methods_to_Fix_%E2%80%9Cost_is_in_use_and_cannot_be_accessed%E2%80%9D\"><\/span>Methods to Fix &#8220;ost is in use and cannot be accessed&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>After you have detected the error and found the reasons behind it, the next step resolves this error. For this, there are five approaches which will help you to understand how to fix inaccessible\u00a0OST error.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_1_Close_All_Outlook_Related_Processes\"><\/span>Method 1: Close All Outlook Related Processes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>One of the initial steps that may be helpful to fix the inaccessible errors is to stop the background Outlook process. Follow the step to perform the task.<\/p>\n<ol>\n<li>Close the Microsoft Outlook safely.<\/li>\n<li>Right click on the Taskbar &gt; select Task Manager.<\/li>\n<li>Choose the \u201cProcesses\u201d tab.<\/li>\n<li>Search \u201cLync\u201c, \u201cucmapi\u201d, \u201cCommunicator\u201c or \u201cOutlook\u201c.<\/li>\n<li>If you find any of these, select the process and Click End task button.<\/li>\n<\/ol>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_2_Disable_Cached_Exchange_Mode\"><\/span>Method 2: Disable Cached Exchange Mode<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In this method you just need to disable the cache Exchange Mode by following below procedure:<\/p>\n<ol>\n<li>After you close Outlook, Open \u201cControl Panel\u201d and choose \u201cMail\u201c.<a href=\"https:\/\/www.sysinfotools.com\/blog\/wp-content\/uploads\/2019\/02\/Disable_Cache.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6158\" src=\"https:\/\/www.sysinfotools.com\/blog\/wp-content\/uploads\/2019\/02\/Disable_Cache.png\" alt=\"Disable Outlook Cache mode\" width=\"437\" height=\"300\" \/><\/a>\n<li>Select Email Accounts button &gt; choose the Email tab.<\/li>\n<li>Choose the Email ID &gt;&gt; Click on the Change.<\/li>\n<li>Un-select the option Use Cached Exchanged Mode&gt;&gt; Next&gt;&gt; Finish.<\/li>\n<\/ol>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_3_Disable_Outlook_Add-ins\"><\/span>Method 3: Disable Outlook Add-ins<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Add-ins are meant to improve the functionality of any applications, be it an Outlook. But many faulty add-ins can cause your application than to benefit it. Therefore we must disable those add-ins that are harming Outlook or its files. To disable Outlook add-ins start Outlook in safe mode; by typing outlook \/safe in the Run dialog on Windows. Click \u2018Yes\u2019 on dialog box asking \u201cif you want to start the application in Safe Mode\u201d.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_4_Run_Scanostexe_Application\"><\/span>Method 4: Run Scanost.exe Application<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This one method is mostly opted to solve the error \u201cost file is in use cannot be accessed\u201d to make OST file in readable state<\/p>\n<ol>\n<li>Launch Scanost.exe<a href=\"https:\/\/www.sysinfotools.com\/blog\/wp-content\/uploads\/2019\/02\/Locate-scanost.png\"><br \/><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6160 alignnone\" src=\"https:\/\/www.sysinfotools.com\/blog\/wp-content\/uploads\/2019\/02\/Locate-scanost.png\" alt=\"how to locate OST file\" width=\"437\" height=\"300\" \/><\/a>\n<li>Choose the Mailbox &gt; Select \u2018Repair Errors\u2018 &gt; Click \u2018Begin Scan\u2019.<\/li>\n<li>The Repair process will your few minutes to scan hierarchy and fix the error.<\/li>\n<\/ol>\n<p>Note: This method can only work till Outlook 2007.<\/p>\n<p>Also Read- <a href=\"https:\/\/www.sysinfotools.com\/blog\/ost-file-size-not-reducing-after-archiving\/\"><strong>Fix OST File Size not Reducing after Archiving Issue<\/strong><\/a><\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_5_Repair_OST_file_with_Professional_Software\"><\/span>Method 5: Repair OST file with Professional Software<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>One of the most recommend and user choices method is to use the professional software for a quick repair of corrupted OST file. For that, you much opt for a reliable and result-oriented <strong>OST Recovery tool<\/strong>. The tool helps you to retrieve all your data from corrupt and damaged OST file. It also offers you to save your repaired data into another file format like OST file to PST, DBX, EML, MSG, and MBOX. This tool helps to fix <a href=\"https:\/\/www.sysinfotools.com\/blog\/outlook-ost-has-reached-maximum-size-error\/\"><strong>Outlook OST has Reached Maximum Size<\/strong><\/a> error.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Final_words\"><\/span>Final words<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can use any of the explained in this article after you have identified the error with its cause. It is very important to resolve \u201cthe file username.ost is in use and cannot be accessed\u201d error to continue working with Outlook emails. But for a quick and better solution, choose for OST Recovery Software.<\/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;6154&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;Solve Error: Ost is in Use and Cannot be Accessed in Outlook&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:- An OST file is saved on the system i.e. the exact copy of users&#8217; mailboxes on the Exchange server.<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/fix-ost-is-in-use-and-cannot-be-accessed-outlook\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":6155,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1588],"tags":[1393,482,1394],"class_list":["post-6154","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ms-outlook","tag-cannot-access-ost-file-in-outlook","tag-microsoft-outlook-2","tag-ost-is-in-use-and-cannot-be-accessed"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fix Error: Ost is in Use and Cannot be Accessed in Outlook<\/title>\n<meta name=\"description\" content=\"If you are dealing with \u201cusername.ost is in use and cannot be accessed\u201d in Outlook 2016; 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