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Microsoft 365 and Office | Microsoft 365 Defender | For home | MacOS
An integrated threat protection solution designed to detect, investigate, and respond to cyber threats across Microsoft 365 services.
If Outlook has stopped working in your Microsoft 365 subscription, there are several troubleshooting steps you can take:
- Investigate Add-Ins: Sometimes, add-ins can cause Outlook to crash. Start Outlook in safe mode by using the command
Outlook /safe. If it works fine in safe mode, disable all add-ins and then re-enable them one at a time to identify the problematic one. - Repair Office: You can try repairing your Office installation. Go to Control Panel, select "Uninstall a program," right-click your Office installation, and choose "Change" followed by "Online Repair."
- Run Diagnostics: Use the Microsoft Support and Recovery Assistant (SaRA) to diagnose and fix issues with Outlook. Make sure you're using the same Windows device that has classic Outlook installed.
- Create a New Profile: If the issue persists, consider creating a new Outlook profile. Go to Control Panel, click on "Mail," then "Show Profiles," and add a new profile.
- Check for Updates: Ensure that your Outlook and Windows are up to date. Outdated software can lead to performance issues.
If these steps do not resolve the issue, you may want to consult additional resources or support from Microsoft.