Our emails at least get a bounce message from Microsoft addresses, which I suppose is something :-)
Earlier in the year, following WannaCry, we were getting a lot of bounces from UK government addresses as they tightened their filters. At the time, we were using the service providers webmail (1&1 as it happens), so everything went through their pool of SMTP servers. Not surprisingly, there are a lot of unsavory characters using these same servers, so blacklisting them wasn't unreasonable. The solution we adopted was to move mail onto our VPS and run our own Postfix server, which so far has worked perfectly for the entire planet EXCEPT MICROSOFT.
Hotmail (and outlook.com etc) routinely bounce our emails because the IP address of our VPS is in the *same block* as a blacklisted server. Numerous emails to Microsoft and 1&1 have failed to resolve this, and frankly I now just tell people not to expect mail to these addresses to get through. If there was a concerted effort by SMTP admins to blacklist MS addresses until they honour the RFCs I would sign up in a flash - they just think they are too big to have to play by the rules.