Scroll up you will see a link in a previous email.

I will put it here, hopefully it will work

https://www.alitajran.com/fix-winmail-dat-attachment-in-office-365/#h-how-to-fix-winmail-dat-attachm...

I followed the instructions there and it fixed our long standing problem. I got no help from QB about this, they counseled me to wait for an update.

Its also an extremely obscure setting...but follow it exactly, should fix your problem. Good luck!