We have an Exchange server that is trying to run XMON but we keep getting message delays from the Outlook clients connecting to the server while it is loaded. When we turn it off the messages delays almost completely disappear. The thread count we have is 5. We are running a Dell 2950 with 8G memory with Windows Enterprise 2003 OS and Exchange 2003 Enterprise. Currently our memory maxes out around 50% utilization and the processor utilization is not even hitting 10%. With XMON running it goes to maybe 20% for the processors. Is it a serious issue to up the thread count to say 9? Here is the previous post: http://www.wilderssecurity.com/showthread.php?t=119846&highlight=xmon+thread+count XMON can scan emails in multiple threads which results in higher number of emails scanned at a time. However, every thread requires a lot of resources, hence there are 3 threads preset. This number can be computed for various hardware configurations using the aforementioned formula. I too doubt that HyperThreading could count as another CPU. Even if you had a dual-core CPU, it wouldn't mean that the overall efficiency would be twice as higher as with a sigle-core CPU.