I have Exchange 2003 and Outlook 2003 clients.

How do I prevent users from adding additional mailboxes (other than their
own) to their Outlook profiles? I am afraid that someone may be trying to
read email of other users by adding extra profiles in Outlook.

I know you can go in to the Control Panel and access the Mail settings but
this can also be done via OutlookToolsEmail Accounts...

I have the Control Panel disabled but how do I stop this via Outlook or
Exchange?

Group Policy maybe? (I can't find a setting though.)

Thanks in advance!