I was led to this "answer" from a question about how to turn off irritating sound notifications. I was told to go to "File" tab. As you all note, there ISN'T a "File" tab in Outlook 365.
So I finally figured out how to do this:
- Go to Outlook 365 on web.
- Go to Settings "Cog" in upper right.
- Select "General" option.
- Select "Notifications" option.
- Choose which ever option -- mail, calendar, etc. - for which you want to TURN OFF notifications sound.
- UNCLICK "PLAY SOUND" tab.
That's it. Simple enough to explain. What is it about Microsoft Help that needs to make simple instructions complicated, unclear, and/or ambiguous? It's as if it's a point of pride to NOT be straight forward.