Curious about the costs of virtualization ? Microsoft have put up a Windows Server virtualization calculator where you can enter the number of servers, virtual machines and work out which version of Microsoft Windows Server will work with your server/VMs combination.

Sadly, it doesn't actually calculate what would be really helpful - determining how much you could save by consolidating your existing servers and using VMs to provide your requirements. But you can do that quite easily: work out the cost of each of your servers, work out how many you could combine into one server, and then take the new configuration away from the old to find out the savings. Oh, and make sure you count electricity savings into those calculations.