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Reuse/convert a Shared Mailbox alias to a alias of an active user?
3 Questions What I found so fare. I can give the shared mailbox a new alias, delete the active user that was auto-created when the shared mailbox was initially created, then wait for ~15min, and th...
Can be either secondary or primary, but in any case you can just change the UPN to anything you'd like and "free" the alias.
Aaaaand I just remembered that we do need to have at least one alias matching the UPN. Wonder why I blog about things, just to forget them later: https://www.michev.info/Blog/Post/2048/did-you-know-at-least-one-smtp-address-needs-to-match-the-upn-in-office-365
Interesting. So it still sort of has an address policy :P. Good read.