Our company is using Office 365 (E3) for hosted Exchange. We have brought on a couple new admins and the owner does not want them to be able to access his email. However, we still want them to have full permissions to configure other users and work with the Exchange server in general. Is there a way to block admin access to specific mailboxes? Perhaps by putting the users in some sort of security grouping and then limiting the admins to those groups?