Admin Access to Mailbox Store

Hi,

I have an IT support personal who I think has changed mailbox access rights something along the lines of http://www.petri.co.il/grant_full_ma…_2000_2003.htm –

(Granting right to a mailboxes located on a specific server).

The audit log shows nothing as its been cleared – and the defaults have been returned. Is their any where else like the registry where the changes have been made that one can document?

Thx