Outlook has run into an error that is preventing it from working correctly

Try these steps in order:

1. Start Outlook in Safe Mode
   • Press Windows + R.
   • Type Outlook.exe /safe and select OK.
   • If Outlook opens, an add-in is likely causing the problem.
2. Disable Outlook add-ins
   • In Outlook, go to File > Options > Add-Ins.
   • Select COM Add-ins > Go.
   • Clear all check boxes, select OK, then restart Outlook.
   • If Outlook works, re-enable add-ins one at a time to find the cause.
3. Update Office
   • Open an Office app.
   • Go to File > Account.
   • Under Product Information, select Update Options > Update Now.
4. Run an Office repair
   • In Windows, open Settings > Apps > Installed apps.
   • Find the Office installation, select Modify, then run Quick Repair first.
   • If that does not help, run Online Repair.
   • Online Repair reinstalls Office and requires an internet connection.
5. Check for Outlook-specific issues
   • If Outlook freezes when opening files or sending mail, external content, antivirus integration, a damaged profile, or corrupted Outlook data files can cause it.
   • If antivirus is integrated with Outlook, disabling that integration can help. This can reduce protection, so use caution.
6. Create a new Outlook profile
   • Open Control Panel > Programs > User Accounts > Mail.
   • Select Show Profiles.
   • Remove the affected profile if appropriate, then select Add to create a new one.
7. Run Microsoft’s Outlook troubleshooter
   • The Classic Outlook Advanced Diagnostics troubleshooter can automatically check many common causes.
   • It works for classic Outlook on Windows 10 or later.

If the error appears immediately at startup and the built-in Repair now button does nothing, the most relevant next actions are Safe Mode, disabling add-ins, and then a full Online Repair.

• Outlook not responding error or Outlook freezes when you open a file or send mail
• I get a "stopped working" error when I start Office applications on my PC | Microsoft Support
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