Using classic Outlook for Windows in business environments
This also worked for me. But in Windows 11 you will need to
(1) get to APPS via the Control Panel as stated, click on "Installed apps",
(2) then look for "Microsoft 365", and click on the three dots "..." to the right.
(4) Now select "Modify"
(5) then select "On Line repair"
(6) wait for the repair to complete,
The first time I tried to open Outlook after the repair I got an error message, when I tried again it worked.
Good luck!