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+Start classic Outlook in safe modeIn Windows 10, click Start.Type Outlook /safe, in the Search programs and files and then click OK.Close and re-open Outlook.If the issue is resolved, you can keep working, or if you have time, take the following steps to find out what COM Add-in is causing the problem.
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+Then, each item in your calendar folder is checked for known problems that can cause unexpected behavior, such as meetings that seem to be missing. After you've selected a task, you can use the details pane to do things like add more information, add steps, or mark as important. You can view more than one calendar at a time, add other calendars, choose which calendar to display, and create new calendars. You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file. The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape. Use the People page to find, view, create, and edit contacts and contact lists.
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+Start classic Outlook in safe modeIn Windows 10, click Start.Type Outlook /safe, in the Search programs and files and then click OK.Close and re-open Outlook.If the issue is resolved, you can keep working, or if you have time, take the following steps to find out what COM Add-in is causing the problem.
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+Add an Outlook.com alias to your account and send email to Gmail users using that alias. For more information, go to Add or remove an email alias in Outlook.com. If you're having problems sending or receiving email, read how to Fix Outlook.com email sync issues. Outlook forwards meeting invitations to other attendees without anyone actually sending an update or forwarding an invite. This happens to accounts that are configured in the iOS Mail app. If you can't choose any of the menu options, type inside an email message, calendar event, or contact, Outlook may have frozen.
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+When this registry key is set, Outlook will use its own built-in search engine. The built-in search will display the message below to indicate it is not using the Windows Search service. Microsoft has its own tool for automatically scanning and correcting Office when things go awry. You can read about it and then run the Microsoft Support and Recovery Assistant to see if that helps. It can automatically diagnose issues, troubleshoot, and fix problems with Outlook.
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+To effortlessly change your settings so that your inbox looks the way you want it to, see Personalize your new Mail experience in Outlook.com. New features like Files and attachment previews let you see your pictures and files without leaving your inbox. Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other [steps to fix Outlook not opening](https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/) mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running.
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+Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link below. If you can open the original Outlook Data File, you might be able to recover additional items. The Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder. There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't. The next solution to repair Outlook is to reinstall the problematic Outlook version/application.
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+If you decide you don't want the calendar you created, right-click the calendar and select Remove. To show or hide the Folders list, select Show or Hide the navigation pane. Calendar events can be used for your own personal event, or you can invite others steps to fix Outlook not opening to create an in-person or Teams meeting. To change your Mail settings so your inbox looks and behaves the way you want it to, see Personalize your new Mail experience in Outlook.com. You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally. Post questions, follow discussions and share your knowledge in the Outlook.com Community.
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+You can read about it and then run the Microsoft Support and Recovery Assistant to see if that helps. It can automatically diagnose issues, troubleshoot, and fix problems with Outlook. A more general version that can also fix Office, Microsoft 365, and other Outlook problems can be found here.
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+Not something you want to take on lightly, but sometimes you have to. Similar to our earlier suggestion of repairing Office (see #3 Repair Your Microsoft Office above), perform the same steps except choose to Uninstall. Be aware that you may need your product key if you received one. This option could be useful if you constantly have to wait for Outlook to rebuild its data file when you restart. No matter how well written add-ins are steps to fix Outlook not opening (and even Outlook itself), there will always be the occasional Outlook problem that doesn’t seem to go away or may not be related to add-ins at all.
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