Detect email forwarding rules on outlook 2003 client

Hi,

We are currently running Outlook 2003 client and are on Exchange2003/2007
platform. Our management is concerned that some users might be forwarding
all the corporate email to personal email accounts outside the company. So
we are being asked to find out who is doing it and how we can stop this in
future.

So my question, is it possible to detect who is forwarding emails to
external accounts. Only way I see that happeing is by crearing forwarding
rules, however I have not been able to determine a way to grab that
information using a configuration managment tool (SMS, Altiris, etc). I was
hoping that information is kept in a registry somewhere which can be read
back.

Secondly, lets say its not possible to determine who is doing it. What
about disabling the feature, at first thought we may have to disable the
rules functionality completely but that will cause major issues because rules
are also used for other purposes.

Any help in this matter is much appreciated.

Thanks