http://www.microsoft.com/oem/en/Pages/support-faq.aspx
> Q. Can I install OEM software on a virtual machine (VMware)?
>
> A. You can install OEM software in a virtual environment as long as you have a separate license for each
> instance of the software. It is fine to use the OEM version as long as it is properly licensed. To be clear,
> a separate version of the software must be installed for both the “standard” and “virtual” installations.