Outlook 365, Windows 11 suddenly stopped opening (new Outlook for Windows)

Question

Outlook will not open. I opened in safe mode, unchecked add-in, I ran online repair and it is still hanging at the opening window. This started yesterday. Outlook on Android opens fine.

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Moderator note: thread updated with version of Outlook

Answer 1

If Outlook 365 on Windows 11 is hanging at the opening window despite running it in safe mode and performing an online repair, there are a few additional steps you can take to troubleshoot the issue:

1. Investigate Add-ins: Since you mentioned unchecking add-ins in safe mode, ensure that all COM add-ins are disabled. You can do this by going to the File menu, selecting Options, then Add-Ins, and managing COM Add-ins.
2. Create a New Profile: Sometimes, issues with the current profile can cause Outlook to hang. You can create a new Outlook profile by going to Control Panel > Mail > Show Profiles > Add. After creating a new profile, set it as the default and see if Outlook opens correctly.
3. Run Outlook Diagnostics: Use the Microsoft Support and Recovery Assistant (SaRA) to run diagnostics on Outlook. It can help identify and resolve issues related to connectivity and other problems.
4. Check for Compatibility Issues: If you recently updated Windows or installed new software, it might be worth checking for compatibility issues, especially if you are using Google Workspace Sync, which has known issues with certain Windows updates.
5. Reinstall Outlook: If none of the above steps work, consider uninstalling and then reinstalling Outlook to ensure that all components are correctly installed.

If the problem persists, you may want to contact Microsoft Support for further assistance.

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References:

• How to troubleshoot issues that cause Outlook to crash or stop responding when used with Microsoft 365
• Architecture changes in new Outlook

Answer 2

Hi!

Welcome to Microsoft Q&A forum.

Can I confirm when you say "Outlook will not open" is it stuck in loading screen or doing nothing at all when you double click the icon? When did it happen and are there any changes to your computer that you can recall like any updates or recent installations?

Answer 3

Is this the classic Outlook on a PC? For troubleshooting, see https://www.slipstick.com/outlook/basic-troubleshooting-steps-for-outlook/ .

Answer 4

I upgraded Webroot, but added nothing else. Not the classic look, new version, windows11, 365