I run Linux on my desktop

Oauth2 is being used as well as 2FA. We’re not breaking any of that. My local email server will be running on company equipment. I already have ITs approval on this.

I’ve always used multiple email clients. Mutt or mu4e for organization and tasking. OWA for quick emails and the calendar. Since we’ve gone to 2FA, that all stopped until I found davmail. OWA search is really bad, compared to mu or not much anyway.

I want a central server. I don’t want to do mbox again.

Yup, its already setup. I’ve currently got mutt running with a davmail middle, but its slow. A long time ago, we just had IMAP enabled and I used mbsync for a while with a local mbox. But it slowly turned into a mess. Since then we’ve enabled 2FA on O365 and so far I’ve only gotten davmail to work.