I am on Win 10 64 bit Build 1903 I always take all updates.
After the most recent one for the 3rd time this year I cannot start any Office 365 programmes except OneNote.
I have tried MS Apps and Features Quick Repair. Last time it did not work nor again this time.
Now like last time I shall have to go though the "long repair" Uninstall and reinstall Office -takes quite some time.
I hope this works.

Has anyone else experienced this problem in the last few days?

All my recent System Restore points had disappeared except an auto one on 7 October. That did not work