isn't an Outlook issue, but an Exchange issue. Sorry to note we don't have a forum for Microsofts server products.
Better ask your Exchange administrator. He can ask Microsoft, if necessary, or go looking around for Exchange add-ons.
Our organization is currently on Microsoft Outlook 2002(Sp3). When permissions are given to access another staff member's emails, whether it be consensual (through delates option)or by Manager's approval when staff member is out on leave (non-consensual), is there somewhere in the system where an Administrator can produce a log to show the listing of staff members who have access to other staff members emails, and that would also show if the email access was put through via consensual or non-consensual?