Office 365 shared mailboxes with Microsoft 365 Channel (APP/OAuth)

[timnis]

Just found I can use Postmaster Filter so I can get rid of extra licenseses

Best way to connect Office 365 Shared Mailboxes

This is (still) technically possible but not recommended by Microsoft, or at least not officially allowed. They explicit say that you don’t enable the account and don’t give it a known password. Their recommendation is to give another user rights on the shared mailbox, like I mentioned above. You will have a problem with this configuration once they change the way it works and they can change it whenever they want as it was never supposed to work that way. Exchange Online limits - Service Desc…