{"id":609,"date":"2017-12-15T11:58:14","date_gmt":"2017-12-15T11:58:14","guid":{"rendered":"http:\/\/arysontechnologies.com\/blog\/?p=609"},"modified":"2026-07-13T09:57:07","modified_gmt":"2026-07-13T09:57:07","slug":"outlook-wont-open-cannot-start-outlook","status":"publish","type":"post","link":"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/","title":{"rendered":"Fix &#8220;Cannot Start Outlook \/ Unable to Open Outlook Window&#8221; Error"},"content":{"rendered":"<p class=\"block_sum\"><em><strong>Summary: <\/strong>Are you facing the frustrating &#8220;Cannot start Microsoft Outlook&#8221; or &#8220;Cannot open the Outlook Window&#8221; error when you try to launch Outlook? It is a surprisingly common issue for many Outlook users. Typically, this problem indicates an underlying issue with your <strong>Outlook profile<\/strong>, a <strong>corrupted data file (PST\/OST)<\/strong>, or <strong>incorrect application settings<\/strong>.<br \/>In this comprehensive guide, we&#8217;ll walk you through various methods to effectively fix the &#8220;Outlook won&#8217;t open&#8221; error. From simple troubleshooting steps to more advanced solutions like <a href=\"https:\/\/www.arysontechnologies.com\/outlook-pst-repair.html\"><strong>Aryson Outlook PST Recovery Tool<\/strong><\/a>, our goal is to help you get Outlook up and running smoothly again.<\/em><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.arysontechnologies.com\/demo-version\/aryson-outlook-recovery.exe\"><i class=\"icon-windows\"><\/i> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/outlook-recovery\/order-now.html\"><i class=\"icon-windows\"><\/i> Purchase Now<\/a><\/span><\/p>\r\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-light-blue 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 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#Why_Does_Outlook_Show_%E2%80%9CCannot_Open_the_Outlook_Window%E2%80%9D_Error\" >Why Does Outlook Show \u201cCannot Open the Outlook Window\u201d 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.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#How_to_Fix_the_%E2%80%9COutlook_Wont_Open%E2%80%9D_Error\" >How to Fix the &#8220;Outlook Won&#8217;t Open&#8221; 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.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#05_Methods_to_Fix_%E2%80%9CCannot_Start_Outlook_Unable_to_Open_Outlook_Window%E2%80%9D_Error\" >05 Methods to Fix &#8220;Cannot Start Outlook \/ Unable to Open Outlook Window&#8221; 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.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#1_Start_Outlook_in_Safe_Mode\" >1. Start 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-5\" href=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#2_Reset_the_Outlook_Navigation_Pane\" >2. Reset the Outlook Navigation Pane<\/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.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#3_Create_a_New_Outlook_Profile\" >3. Create 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-7\" href=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#4_Repair_Corrupted_Outlook_Data_Files_PSTOST\" >4. Repair Corrupted Outlook Data Files (PST\/OST)<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#How_to_use_ScanPSTexe\" >How to use ScanPST.exe:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#5_Use_a_Reliable_Professional_Tool_for_Severe_Corruption\" >5. Use a Reliable Professional Tool for Severe Corruption<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#Easy_Steps_to_Repair_Outlook_Data_File_Errors\" >Easy Steps to Repair Outlook Data File Errors:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#Final_Tips_to_Avoid_This_Error_Again\" >Final Tips to Avoid This Error Again<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#Conclusion\" >Conclusion<\/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.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#Frequently_Asked_Questions_FAQs\" >Frequently Asked Questions (FAQs):-<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Why_Does_Outlook_Show_%E2%80%9CCannot_Open_the_Outlook_Window%E2%80%9D_Error\"><\/span>Why Does Outlook Show \u201cCannot Open the Outlook Window\u201d Error?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Before fixing the problem, let\u2019s quickly understand why this error occurs. Here are some common reasons:<\/p>\r\n<table border=\"2\">\r\n<tbody>\r\n<tr>\r\n<td>\r\n<p><strong>Possible Causes<\/strong><\/p>\r\n<\/td>\r\n<td>\r\n<p><strong>What It Means<\/strong><\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\r\n<p>Corrupt Outlook Profile<\/p>\r\n<\/td>\r\n<td>\r\n<p>Your Outlook user settings are broken or unreadable.<\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\r\n<p>Damaged PST or OST File<\/p>\r\n<\/td>\r\n<td>\r\n<p>If the data file storing your emails is corrupted or unreadable.<\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\r\n<p>Faulty Add-ins<\/p>\r\n<\/td>\r\n<td>\r\n<p>Installed Outlook add-ins may be preventing Outlook from loading.<\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\r\n<p>Sometimes, Problem with the Navigation Pane<\/p>\r\n<\/td>\r\n<td>\r\n<p>This is the panel on the left of Outlook (Inbox, Sent Items, etc.).<\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\r\n<p>Compatibility Mode Enabled<\/p>\r\n<\/td>\r\n<td>\r\n<p>Outlook may be running with settings meant for an older Windows version.<\/p>\r\n<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\r\n<p>Moreover, incorrect Outlook Startup Command<\/p>\r\n<\/td>\r\n<td>\r\n<p>Outlook is being opened with a broken or wrong shortcut.<\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_to_Fix_the_%E2%80%9COutlook_Wont_Open%E2%80%9D_Error\"><\/span>How to Fix the &#8220;Outlook Won&#8217;t Open&#8221; Error<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>When Microsoft Outlook refuses to open, it&#8217;s incredibly frustrating. This issue often stems from common culprits like a corrupted user profile, a damaged data file (PST or OST), or even a minor conflict within its settings or add-ins. The good news is that most &#8220;Outlook won&#8217;t open&#8221; errors can be resolved with a few proven troubleshooting steps.<\/p>\r\n<p>Below, we&#8217;ll guide you through a series of solutions, from simple, quick fixes to more in-depth repairs, to help you get Outlook up and running again.<\/p>\r\n<p class=\"also-read\">Aslo Read: How to <a href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-damaged-outlook-personal-folder-file\/\">Fix Damage Outlook Personal Folder File<\/a>?<\/p>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"05_Methods_to_Fix_%E2%80%9CCannot_Start_Outlook_Unable_to_Open_Outlook_Window%E2%80%9D_Error\"><\/span>05 Methods to Fix &#8220;Cannot Start Outlook \/ Unable to Open Outlook Window&#8221; Error<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Learn five effective methods to fix the &#8220;Cannot Start Outlook&#8221; or &#8220;Unable to Open Outlook Window&#8221; error. This guide covers quick troubleshooting steps like Safe Mode and profile creation, ensuring you can quickly regain access to your emails and get Outlook working smoothly again. These are the following:<\/p>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"1_Start_Outlook_in_Safe_Mode\"><\/span>1. Start Outlook in Safe Mode<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>One of the first and most effective steps is to launch Outlook in <strong>Safe Mode<\/strong>. This mode turns off all add-ins and custom settings, helping you quickly identify if a third-party add-in is causing the startup problem.<\/p>\r\n<p><strong>How to do it:<\/strong><\/p>\r\n<ul>\r\n<li>Press <strong>Windows + R<\/strong> on your keyboard to open the Run dialogue box.<\/li>\r\n<li>Type: outlook.exe \/safe<\/li>\r\n<li>Press <strong>Enter<\/strong>.<\/li>\r\n<\/ul>\r\n<p>If Outlook opens successfully in Safe Mode, it strongly suggests that an add-in is the culprit. To resolve this:<\/p>\r\n<ul>\r\n<li>Go to <strong>File &gt; Options &gt; Add-ins<\/strong>.<\/li>\r\n<li>At the bottom, next to &#8220;Manage,&#8221; select &#8220;COM Add-ins&#8221; from the dropdown and click <strong>Go<\/strong>.<\/li>\r\n<li><strong>Uncheck all<\/strong> the add-ins in the list.<\/li>\r\n<li>Click <strong>OK<\/strong> and then restart Outlook normally.<br \/><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2017\/12\/createoutlookprofile-4-300x184.png\" width=\"300\" height=\"184\" \/><\/li>\r\n<\/ul>\r\n<p>You can then re-enable add-ins one by one to pinpoint the problematic ones.<\/p>\r\n<p class=\"also-read\">Aslo Read: How to <a href=\"https:\/\/www.arysontechnologies.com\/blog\/open-ost-file-into-outlook-2013-2016-2010-2007\/\">Open OST File into Outlook<\/a>?<\/p>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"2_Reset_the_Outlook_Navigation_Pane\"><\/span>2. Reset the Outlook Navigation Pane<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>The navigation pane, which typically displays your Inbox, Sent Items, and other folders on the left sidebar, can sometimes become corrupted. A simple reset often resolves this and allows Outlook to open correctly.<\/p>\r\n<p><strong>How to reset it:<\/strong><\/p>\r\n<ul>\r\n<li>Ensure Outlook is completely closed.<\/li>\r\n<li>Press <strong>Windows + R<\/strong> to open the Run dialog box.<\/li>\r\n<li>Type: outlook.exe \/resetnavpane<\/li>\r\n<li>Press <strong>Enter<\/strong>.<\/li>\r\n<\/ul>\r\n<p>This command clears any broken settings related to the navigation pane and can frequently fix startup issues.<\/p>\r\n<p class=\"also-read\">Also Read: How to <a href=\"https:\/\/www.arysontechnologies.com\/blog\/fix-pst-file-not-showing-emails-in-outlook\/\">Fix PST File Not Showing Emails in Outlook Error<\/a>?<\/p>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"3_Create_a_New_Outlook_Profile\"><\/span>3. Create a New Outlook Profile<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>A damaged or corrupted Outlook user profile is a common reason for &#8220;Outlook won&#8217;t open&#8221; errors. Creating a fresh profile can provide a clean slate for Outlook to start.<\/p>\r\n<p><strong>Steps to create a new profile:<\/strong><\/p>\r\n<ul>\r\n<li>Open the <strong>Control Panel<\/strong> on your system.<\/li>\r\n<li>Search for and click on <strong>Mail (Microsoft Outlook) (32-bit)<\/strong> or <strong>Mail (Microsoft Outlook 20XX)<\/strong>, then choose <strong>Show Profiles&#8230;<br \/><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2017\/12\/createoutlookprofile-1-254x300.png\" width=\"254\" height=\"300\" \/><\/strong><\/li>\r\n<li>Click the <strong>Add&#8230;<\/strong> button to create a new profile.<\/li>\r\n<li>Give the new profile a name (e.g., &#8220;New Outlook Profile&#8221;) and click <strong>OK<\/strong>.<br \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2017\/12\/createoutlookprofile-2-300x121.png\" width=\"300\" height=\"121\" \/><\/li>\r\n<li>Follow the prompts to set up your email account within this new profile.<br \/><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2017\/12\/createoutlookprofile-3-300x211.png\" width=\"300\" height=\"211\" \/><\/li>\r\n<li>Once set up, on the &#8220;Mail Setup&#8221; dialogue box, use the &#8220;Always use this profile&#8221; dropdown menu to select your newly created profile as the default.<\/li>\r\n<li>Click <strong>OK<\/strong> and restart Outlook.<\/li>\r\n<\/ul>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"4_Repair_Corrupted_Outlook_Data_Files_PSTOST\"><\/span>4. Repair Corrupted Outlook Data Files (PST\/OST)<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Outlook stores your emails, contacts, and other data in Personal Storage Table (<strong>PST<\/strong>) or Offline Storage Table (<strong>OST<\/strong>) files. If these files become damaged, Outlook may refuse to open. Microsoft provides a built-in tool called <strong>Inbox Repair Tool (<a href=\"https:\/\/www.arysontechnologies.com\/blog\/find-scanpst-exe-location-in-outlook\/\">ScanPST.exe<\/a>)<\/strong> for minor corruptions.<\/p>\r\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_to_use_ScanPSTexe\"><\/span>How to use ScanPST.exe:<span class=\"ez-toc-section-end\"><\/span><\/h4>\r\n<ul>\r\n<li>Close Outlook completely.<\/li>\r\n<li>Navigate to the location of scanpst.exe. This path varies slightly depending on your Office version:\r\n<ul>\r\n<li><strong>For Office 2016, 2019, 2021, and Microsoft 365 (64-bit Windows, 32-bit Office):<\/strong> C:\\Program Files (x86)\\Microsoft Office\\root\\OfficeXX\\ (where XX is your version number, e.g., Office16)<\/li>\r\n<li><strong>For Office 2016, 2019, 2021, and Microsoft 365 (64-bit Windows, 64-bit Office):<\/strong> C:\\Program Files\\Microsoft Office\\root\\OfficeXX\\<\/li>\r\n<li><em>(If you&#8217;re unsure, you can often search your C: drive for scanpst.exe)<\/em><\/li>\r\n<\/ul>\r\n<\/li>\r\n<li>Find and run scanpst.exe.<\/li>\r\n<li>Click <strong>Browse<\/strong> and navigate to your Outlook data file (.pst or .ost), typically located in Documents\\Outlook Files.<\/li>\r\n<li>Click <strong>Start<\/strong> to begin the scan.<\/li>\r\n<li>If errors are found, click <strong>Repair<\/strong>.<br \/><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2017\/12\/scanpst-300x277.png\" width=\"300\" height=\"277\" \/><\/li>\r\n<\/ul>\r\n<p><strong>Important Note:<\/strong> The Inbox Repair Tool (ScanPST.exe) is effective only for minor corruptions. If your Outlook data file is severely damaged, this tool may not be sufficient.<\/p>\r\n<p class=\"also-read\">Also Read: How to <a href=\"https:\/\/www.arysontechnologies.com\/blog\/recover-deleted-email-from-pst\/\">Recover Deleted Emails from PST File in Outlook<\/a>?<\/p>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"5_Use_a_Reliable_Professional_Tool_for_Severe_Corruption\"><\/span>5. Use a Reliable Professional Tool for Severe Corruption<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>If the above steps, especially ScanPST.exe, fail to resolve the &#8220;Outlook won&#8217;t open&#8221; error, your Outlook data file is likely <strong>severely corrupted or extensively damaged<\/strong>. In such critical situations, a specialized and reliable professional tool like the <strong>Aryson Outlook PST Repair Tool<\/strong> becomes the best solution.<\/p>\r\n<p>This software is specifically designed to handle severely corrupted PST files and can meticulously restore all your valuable Outlook data, including emails, attachments, contacts, calendars, tasks, and notes. Key advantages of using such a tool include:<\/p>\r\n<ul>\r\n<li><strong>Comprehensive Data Recovery:<\/strong> Recovers data even from highly damaged files that ScanPST.exe cannot fix.<\/li>\r\n<li><strong>Maintains Original Structure:<\/strong> Preserves the original folder hierarchy and email properties.<\/li>\r\n<li><strong>Handles Large Files:<\/strong> Capable of repairing oversized PST files without issues.<\/li>\r\n<li><strong>User-Friendly Interface:<\/strong> Often provides a straightforward process with just a few easy steps.<\/li>\r\n<\/ul>\r\n<p>The Aryson Outlook PST Repair tool offers a demo version that allows you to scan your corrupted file and preview recoverable items (often up to 50 items per folder) before committing to a purchase. It enables you to verify its performance and functionality and ensures your critical data can be recovered without hassle.<\/p>\r\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Easy_Steps_to_Repair_Outlook_Data_File_Errors\"><\/span>Easy Steps to Repair Outlook Data File Errors:<span class=\"ez-toc-section-end\"><\/span><\/h4>\r\n<ol>\r\n<li>First, launch the <strong>Outlook PST Repair Tool<\/strong> on your PC.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4948\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/5.jpg\" alt=\"Run Outlook PST Repair Tool\" width=\"700\" height=\"373\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/5.jpg 700w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/5-300x160.jpg 300w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/5-698x373.jpg 698w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/li>\r\n<li>Then, <strong>browse<\/strong> the PST file by clicking on <strong>Open<\/strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4949\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/6.jpg\" alt=\"browse the PST file\" width=\"700\" height=\"373\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/6.jpg 700w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/6-300x160.jpg 300w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/6-698x373.jpg 698w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/li>\r\n<li>Afterwards, choose <strong>Recovery Mode<\/strong> and click <strong>OK<\/strong>.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4950\" src=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/7.jpg\" alt=\"choose Recovery Mode\" width=\"600\" height=\"319\" srcset=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/7.jpg 600w, https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2018\/04\/7-300x160.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/li>\r\n<li>Now, you can cross-verify the added recovered file.<\/li>\r\n<li>After that, click on <strong>Save<\/strong> and complete the recovery process.<\/li>\r\n<\/ol>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Final_Tips_to_Avoid_This_Error_Again\"><\/span>Final Tips to Avoid This Error Again<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul>\r\n<li>Don&#8217;t force-close Outlook while it&#8217;s loading or syncing.<\/li>\r\n<li>Keep <strong>backups of your PST files<\/strong> regularly.<\/li>\r\n<li>Avoid using third-party add-ins unless necessary.<\/li>\r\n<li>Constantly <strong>update Office<\/strong> to the latest version.<\/li>\r\n<li>Use antivirus tools that don&#8217;t interfere with Outlook.<\/li>\r\n<\/ul>\r\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>To sum up, we explored several methods to fix &#8220;Outlook won&#8217;t open&#8221; errors. Whether it&#8217;s a profile issue, a corrupted PST file, or faulty add-ins, the methods above can help you get Outlook running again. If manual processes don&#8217;t work, a professional repair tool like the Aryson Outlook PST Repair Tool is a reliable and user-friendly option to repair corrupted Outlook data files, helping you regain full access to your mailbox with minimal data loss or disruption.<\/p>\r\n<h4 class=\"faq-main_heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_FAQs\"><\/span>Frequently Asked Questions (FAQs):-<span class=\"ez-toc-section-end\"><\/span><\/h4>\r\n\r\n<div class=\"schema-faq wp-block-yoast-faq-block\">\r\n<div id=\"faq-question-1750332985128\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q1. Why can&#8217;t I open Microsoft Outlook?<\/strong><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans.<\/strong> A corrupted profile, a damaged PST file, faulty add-ins, or improper Outlook startup settings often cause this issue.<\/p>\r\n<\/div>\r\n<div id=\"faq-question-1750333027045\" class=\"schema-faq-section\"><strong class=\"schema-faq-question\"><strong>Q2. Is there a way to fix Outlook without reinstalling Office?<\/strong><\/strong>\r\n<p class=\"schema-faq-answer\"><strong>Ans.<\/strong> Yes, you can often fix Outlook without reinstalling Office. Many of the methods described above, such as starting in Safe Mode, resetting the navigation pane, creating a new profile, or repairing PST files with tools like ScanPST.exe or a dedicated PST repair tool, can resolve the issue without a complete Office reinstallation.<\/p>\r\n<\/div>\r\n<\/div>\r\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;609&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;3&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 - (3 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Fix \\u0026quot;Cannot Start Outlook \\\/ Unable to Open Outlook Window\\u0026quot; Error&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 - (3 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary: Are you facing the frustrating &#8220;Cannot start Microsoft Outlook&#8221; or &#8220;Cannot open the Outlook Window&#8221; error when you try<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":4959,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[139],"tags":[],"class_list":["post-609","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-outlook"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fix: &quot;Cannot Start Outlook&quot; (Unable to Open Outlook Window) Error<\/title>\n<meta name=\"description\" content=\"Fix &quot;Cannot Start Outlook&quot; \/ &quot;Unable to Open Outlook Window&quot; error with 5 easy methods. 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Get easy solution to work your Outlook again.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/\" \/>\n<meta property=\"og:site_name\" content=\"Aryson Technologies Blog\" \/>\n<meta property=\"article:published_time\" content=\"2017-12-15T11:58:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-13T09:57:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.arysontechnologies.com\/blog\/wp-content\/uploads\/2017\/12\/fix-cannot-start-outlook-unable-to-open-outlook-window.png\" \/>\n\t<meta property=\"og:image:width\" content=\"698\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Rohan Wiese\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Rohan Wiese\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/outlook-wont-open-cannot-start-outlook\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/outlook-wont-open-cannot-start-outlook\\\/\"},\"author\":{\"name\":\"Rohan Wiese\",\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/#\\\/schema\\\/person\\\/38690c15f14d77f91207a5427b11e5a2\"},\"headline\":\"Fix &#8220;Cannot Start Outlook \\\/ Unable to Open Outlook Window&#8221; Error\",\"datePublished\":\"2017-12-15T11:58:14+00:00\",\"dateModified\":\"2026-07-13T09:57:07+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/outlook-wont-open-cannot-start-outlook\\\/\"},\"wordCount\":1438,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/outlook-wont-open-cannot-start-outlook\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/wp-content\\\/uploads\\\/2017\\\/12\\\/fix-cannot-start-outlook-unable-to-open-outlook-window.png\",\"articleSection\":[\"Outlook\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/outlook-wont-open-cannot-start-outlook\\\/#respond\"]}]},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/outlook-wont-open-cannot-start-outlook\\\/\",\"url\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/outlook-wont-open-cannot-start-outlook\\\/\",\"name\":\"Fix: \\\"Cannot Start Outlook\\\" (Unable to Open Outlook Window) Error\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/outlook-wont-open-cannot-start-outlook\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/outlook-wont-open-cannot-start-outlook\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.arysontechnologies.com\\\/blog\\\/wp-content\\\/uploads\\\/2017\\\/12\\\/fix-cannot-start-outlook-unable-to-open-outlook-window.png\",\"datePublished\":\"2017-12-15T11:58:14+00:00\",\"dateModified\":\"2026-07-13T09:57:07+00:00\",\"description\":\"Fix \\\"Cannot Start Outlook\\\" \\\/ \\\"Unable to Open Outlook Window\\\" error with 5 easy methods. 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Why can't I open Microsoft Outlook?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans.<\/strong> A corrupted profile, a damaged PST file, faulty add-ins, or improper Outlook startup settings often cause this issue.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#faq-question-1750333027045","position":2,"url":"https:\/\/www.arysontechnologies.com\/blog\/outlook-wont-open-cannot-start-outlook\/#faq-question-1750333027045","name":"Q2. Is there a way to fix Outlook without reinstalling Office?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans.<\/strong> Yes, you can often fix Outlook without reinstalling Office. Many of the methods described above, such as starting in Safe Mode, resetting the navigation pane, creating a new profile, or repairing PST files with tools like ScanPST.exe or a dedicated PST repair tool, can resolve the issue without a complete Office reinstallation.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/posts\/609","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/comments?post=609"}],"version-history":[{"count":6,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/posts\/609\/revisions"}],"predecessor-version":[{"id":7009,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/posts\/609\/revisions\/7009"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/media\/4959"}],"wp:attachment":[{"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/media?parent=609"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/categories?post=609"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.arysontechnologies.com\/blog\/wp-json\/wp\/v2\/tags?post=609"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}