In this post we want to highlight some upcoming changes around license re-assignment in Exchange Online to help admins get clarity on mailbox behavior and how license re-assignment works. The new behavior for re-licensed users will be effective from about end of March 2022, onwards.
When an Exchange Online license for a user is revoked, the user object is converted to a mail user (MailUser). When a license is re-assigned to the user, one of two things happen, depending on the timing of re-assignment:
If the Exchange Online license is re-assigned even after 30 days, every user will have a mailbox assigned to them. With this change we are no longer assuming that the user was off-boarded after 30 days. Since the user had a mailbox when the license was removed, their mailbox will be reactivated after a license has been reassigned.
Note:
Exchange Online Team
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