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 One reason Outlook fails to launch is that you’ve installed faulty add-ins in the app. These add-ins may be working incorrectly, causing the app not to launch. If you can't choose any of the menu options, type inside an email message, calendar event, or contact, Outlook may have frozen. There are three steps you can take to try to get Outlook working again.
 These dialog boxes often don’t allow Outlook to respond properly, so check for any open dialog boxes on your system. By installing add-ins in Microsoft Outlook, you can combine the application with extra features or functionalities that were not available by default. The navigation pane is the leftmost pane in Outlook where you'll find your folder list and the icons to move between Mail, Calendar, People, and Tasks.
 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 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.
 Microsoft Outlook is a powerful email client, but users may occasionally encounter various error codes that disrupt email functionality. This guide outlines some of the most common Outlook error codes, their causes, and step-by-step troubleshooting methods. If you're having problems sending or receiving email, read how to Fix Outlook.com email sync issues. The methods provided in this article can be used to troubleshoot the error messages listed in the following table. If you typically use an Outlook.com account for email, this issue can occur if there are multiple aliases on the account and the 3rd party email address is the primary alias.
 However, if you want to change your password with your email provider, you'll need to visit their website or help desk, or contact your email administrator. For example, if you have a Yahoo! account, you first have to change your password at Yahoo.com. Once you've changed your password with your email provider, you can update the password in Outlook. See Change or update your email password for more information.
 Outlook stores all your email messages, meetings and events, contacts, and tasks in data files. These files occasionally might become corrupted. You can run the Inbox Repair Tool (scanpst.exe) to scan your Outlook data files and repair errors. Over the last couple of weeks it will not open normally (not even in safe mode) and I am having to do the windows repair option in settings. I have also tried the Classic Outlook Profile Set Up Troubleshooter.
 I couldn’t find [Fix Outlook Site](https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html) anything in the Event Viewer that points to the root cause, nor could I find any similar issues online. However, if you encountered other issues like Outlook not responding, learn how to fix Outlook not responding here. Once you have made these changes in your PST file, Outlook should open without encountering any more problems. Click the above link to have a quick download, then you can have Outlook errors fixed within minutes. If you do everything properly, Outlook will open when you use the new profile.
 Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. We love reading your suggestions on new features and feedback about how you use our products! To learn more about how to share your feedback, see How do I give feedback on Microsoft Office. Set up your account manually as an IMAP or POP account in Outlook.
 I finished the migration for legacy MFA since 1 months but I still have the problem. If none of that worked, I’d restore the server from backup when it was working and see what happens moving forward. If both of those don’t fix it, I’d run a full maintence cycle on the server.
 If you're having problems setting up your email in classic Outlook, we want to help. Find solutions to common problems or get help from a support agent. If you can't open Outlook, or Outlook disappears or crashes, one of your add-ins may be to blame or you may need to update Outlook. You can give feedback by selecting Help from the top menu, then Feedback. If your mailbox is full, we won't be able to reply to your request.
 Running the /resetnavpane command removes all customizations to the navigation pane. It's not uncommon, and you can easily make Microsoft's email and calendar app open with a few simple fixes. We’ll show you what to do on your Windows 11 or Windows 10 PC.
 Should you decide to remove a profile, back up the data files first. All offline cached content will be deleted when you choose Remove. For more information, see Introduction to Outlook Data Files (.pst and .ost).
 It is a powerful and almighty software that can be applied to fix corrupt Outlook Fix Outlook Site PST files in any scenarios. I just have the hourglass that disappears after a minute. After multiple restarts the program will open one time, then reverts. There are other issues, too, that can contribute. Maybe you've added a new program to your computer that doesn't get along with Outlook, or your system has a virus. Regardless of the specific cause, there are several key troubleshooting fixes to try that might help.