DRA and ExA let you manage Microsoft Exchange mailboxes as an extension of user account properties. This integration allows you to simplify your administration workflows so you can effectively administer Exchange properties.
You can manage Microsoft Exchange mailboxes for user accounts in the managed domain or managed subtree. Each aspect of managing Microsoft Exchange mailboxes requires different powers. The powers you have control which mailbox properties you can modify, or whether you can create, clone, view, or delete Microsoft Exchange mailboxes. You can also manage mailbox rights and permissions associated with a user account, allowing you to control the security of your Microsoft Exchange environments. If you do not have the required power to modify a tab or field for the selected mailbox, DRA disables the tabs and fields that you cannot modify.