$WORK migrated my email to Office365 this week.
I've had a similar experience and was able to reintegrate nmh by using
Davmail to provide a POP interface to Office365---if they don't provide
one for you already. Use search engines to discover more about Davmail.
Thank you for that pointer; sadly, I went through the whole process of
getting it started, it DID pop up the right window to prompt for MFA,
but the domain I use is configured to require administrator approval to
use another email application. I'll try to go that route but I don't
have much hope.
--Ken
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