Using New Outlook on Windows for personal email, calendar, and contact management
Hi,
Which device are you using, and do you see an error message before Outlook closes?
If you’re using classic Outlook on Windows, press Windows + R > Type outlook.exe /safe and press enter > If Outlook stays open in Safe Mode, an add-in may be causing the crash.
If you're ysing new Outlook on Windows, open Settings > Apps > Installed apps > Click Outlook then choose Advanced options > Repair if available.
Once the repair finishes, open Outlook again.