Despite not having Windows 7 "SP2", Microsoft just released a hotfix roll up which contains everything since SP1:
CSI's Paladin Remote Monitoring solution uncovered two major Exchange 2010 email crisises in the span of an hour on Wednesday. One affected a little under 700 users and the other about 1350 users.
The first event was that Paladin gave us an Exchange alert called "back pressure". This is where Exchange believes that it is going to be unable to do its job based upon the rate of server resources (RAM and disk space) it is consuming.