http://blogs.technet.com/b/puneetvig/archive/2010/07/27/windows-server-virtualization-calculators.aspx  Two ways to estimate the number and cost of Windows Server Standard Edition, Enterprise Edition and Datacenter Edition licenses needed for your virtualization scenarios:     CALCULATOR 1   CALCULATOR 2 Calculator 1 is designed toen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)