Sorry to post such a picky little issue. I guess that I must be OCD and want everything to work as it should.

I have:
Win 10 Pro X64 build 1511
Outlook 2007

When new mail arrives, I get the default new mail sound (Windows Notify e-mail.wav). I tried to change the sound but regardless of what I choose, I still get the default sound.

I have "Play Sound" checked in Outlook.
I have attempted to change the sound file in Windows/Control Panel/Sounds

The default e-mail sound plays regardless of the sound file chosen.

See - I told you this was picky!

Any ideas?