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Discrepancy with shared mailbox when removing user-mailbox
Hello, When we remove a mailbox from Exchange 365, we see a discrepancy with the shared mailboxes the user had access/permissions for. - the user-object is deleted for "Full-Access" - the user-o...
This is expected behavior — Full Access is mailbox-level and gets cleaned up automatically, but Send As is an Active Directory permission and isn’t removed when the user is deleted. You’ll need to manually clean up the orphaned Send As entries from the shared mailboxes.
Before deleting a user's mailbox, first migrate the Full Access permissions of the shared mailbox to another user in the Exchange Admin Center to avoid loss of ownership.