Hi Conor,
It may be caused by some reasons. You can run a Non-Owner Mailbox Access Report to find mailbox that have been accessed by someone other than the person who owns the mailbox.
Thanks,
Jerry Cen
Hi Conor,
It may be caused by some reasons. You can run a Non-Owner Mailbox Access Report to find mailbox that have been accessed by someone other than the person who owns the mailbox.
Thanks,
Jerry Cen