[defanor]

I'm in a situation similar to the one you were in (mu4e, Exchange IMAP at work), and mbsync (version 1.2) works for me. Not sure what Exchange version is there, and I had to configure it a bit both initially and after an MS Exchange update -- but just some basic settings, such as `SSLType STARTTLS`, setting CertificateFile manually, `AuthMechs LOGIN`.

[simplect]

I like mu4e because it integrates with orgmode well. However, it is not the best client for managing Exchange meeting invites and plain text responses are not very readable in outlook. Were you able to solely rely on mu4e without using Outlook?

[defanor]

Yes, and I've actually never used Outlook with Exchange. But I'm only sending plain text responses, not trying to use any advanced features, and it works fine to receive and read meeting invites (just as messages).

What goes wrong with plain text responses in Outlook, by the way?

[simplect]

Outlook uses small fonts to render the response and there is a noticeable gap in readability between HTML formatted and plain text responses.