Repair Outlook in Windows 10:
Close all Microsoft Office applications.
Type Apps & Features into the Windows search box.
Select Apps & Features.
Find and select Microsoft Office in the list of installed apps and features.
Select Yes if a user account control window appears asking, “Do you want to allow this app to make changes to your device?”
Select Online Repair and then the Repair button.
Restart Outlook when the repair process is complete.
If Outlook still won’t open, try another troubleshooting technique