http://blogs.technet.com/clive_watson/archive/2007/05/29/windows-server-virtualization-calculator-s.aspxI stumbled on this today , it seems there is a second calculator now available (the first was made available in January ). The licensing page has been updated to reflect the two calculators: Calculator 1 - is designed to estimate the licenses and costen-GBCommunityServer 2.1 SP1 (Build: 61025.2)