Need Microsoft Outlook email security help

Guten morgen fellow geeks:

Situation:
Corporate Outlook account, accessible with user's main network login, emails presumably backed up on networked server. Possibility that IT or higher corporate levels may access account with user's creds to delete emails (some nasty game-playing going on). Aside from backing up all emails to off-network location...

Question:
Is there a program (or hotfix) out there that can track and report with time/date-stamp whenever (or wherever) an Outlook email account is accessed, and what changes might have been made during that access? Or is there something in Outlook that does the same thing?

Going into the account today to see what can be done; any advice appreciated (and will earn you good geek karma).

- Taarna, who is tired of silly people :major