Life prior to 15.21.1 upgrade was OK.
Could start Outlook for Mac, select new email and away I go.
Following the update to 15.21.1, every time I start a new email or reply to a new email I get the message "some of the files in this web page aren't in the expected location. do you want ot download them anyway? if you're sure the web page is from a trusted
source, click yes"
I assume it's referring to my signature, which is provided to my by my employer, so I trust it :-)
After that, I keep getting annoying clicks when I type on the keyboard, or boing noises...didn't encounter this, pre 15.21.1