This is found on the MS website:
Q. If Windows Server 2003, Enterprise Edition, is used as the host environment, am I granted four virtual licenses? What if VMWare is the host?
A.
Licensing does not depend on which virtualization technology is used. With a license for Windows Server 2003 R2, Enterprise Edition, you can run one instance of the software in a physical operating system environment and up to four instances in virtual operating system environments. With VMWare GSX Server, this means you can run one physical instance plus four virtual instances. With VMWare ESX Server, it means you can run four virtual instances because there is no need for a physical instance.
...but what if you run Vmware Server on Linux? Can you still run 4 virtual machines off a single license?
Any MS licensing God out here that knows the answer? Thanks!
PS. As far as I understand the licensing whitepaper on virtualisation, 4 instances for W2K3 R2 is permitted regardless of the host OS - but I want to make sure...