Microsoft Outlook Is Not Opening Or Responding

Because the tag indicates New Outlook for Windows, classic Outlook fixes such as Safe Mode, COM add-ins, creating a new Outlook profile, SCANPST, or the classic Outlook troubleshooter do not apply.

Try these steps:

1. End Outlook completely
   • Open Task Manager.
   • End any Microsoft Outlook processes that are still running.
   • Try opening Outlook again.
2. Open Outlook from Microsoft Store
   • Open Microsoft Store.
   • Search for Outlook for Windows.
   • Launch it directly from the Store page instead of the existing shortcut.
3. Check Outlook on the web
   • Since the browser version is showing server error while other sites work, try again after closing and reopening the browser.
   • If Outlook on the web still fails but the Windows app opens, use the app temporarily.
   • If the web version works later, that helps confirm the issue is isolated to the app or a temporary Outlook service problem.
4. Check Event Viewer if the app starts and then hangs or closes
   • Open Event Viewer.
   • Go to Windows Logs > Application.
   • Try opening Outlook again.
   • Check the newest relevant application event for Outlook.
5. Use the web version temporarily if available
   • If Outlook on the web starts working before the app does, use it as a temporary workaround while continuing app troubleshooting.

If Outlook still does not open after those steps, the supported guidance for New Outlook for Windows is to avoid classic Outlook repair paths and continue with New Outlook troubleshooting only.

• outlook wont open - Microsoft Q&A
• Outlook crashes or stops responding when used with Office 365 | Microsoft Support