A general question that I would like to have some experts opinions on. What are you feelings about installing software on a Windows 2003 domain controller. We already have McAfee VirusScan 8.7 installed. We just purcahsed McAfee Anti-Spyware as an add-on to VirusScan 8.7. Is it neccessary to install the add-on to our DC's? Is it neccessary to even have VirusScan 8.7 installed?