Server 2008 R2 Virtual Key Licensing

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http://serverfault.com – As per Microsoft's website, when you purchase Server 2008 R2 Enterprise, you're entitled to 4 virtual machines to run on that host. I know that if you purchase the product as a FPP or as OEM, you are provided with a seperate virtual key, but what happens if the product was purchased as another type (e.g. volume licensing)? Can you use the same key as the host when activating the VMs? (HowTos)