MS Exchange - Anti-virus

["Cheek, Leigh" <lcheek () UTK EDU>]

I am auditing a cluster of MS Exchange 2003 servers. No anti-virus (AV)
protection software is running on these servers and MS Office is not
installed. Systems admins do not access e-mail or surf the Web from
these servers. 

I know that there is a performance hit when you install AV software and
that AV, especially McAfee, can be difficult to tune and testing is a
must. From what I have read on blogs and at Microsoft's site, I believe
that installing AV is best practice for protecting these servers. 

1. I have heard of problems with McAfee. If you have installed AV on
your MS Exchange servers, what are your using?  
2. Do you believe AV should or should not on MS Exchange 2003 servers?
Why? 

I appreciate your help.

Thanks,
Leigh Cheek, CIA, CISA
Auditor
Audit and Consulting Services
University of Tennessee
149 Conference Center Building
Knoxville, TN 37996-4114
(865) 974-4420
fax (865) 974-6171
lcheek () utk edu