How many instances of Windows Server 2008 R2 can be installed in multiple Hyper-V instances from a single license (activation key) on the same server using the exact same activation key?

How many instances of Windows Server 2008 R2 can be installed in multiple Hyper-V instances from a single license (activation key) on the same server using the exact same activation key?

I need to know how many times I can use the same Microsoft license (activation key) to install the same instance of Windows Server 2008 R2 as my base operating system (using the exact same product key) and then how many times I can use this same license (activation key) to install multiple instances in the Microsoft Windows Hyper-V environment.
IT GuyNetwork EngineerAsked:
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Paul MacDonaldDirector, Information SystemsCommented:
You don't mention which edition you're using, but here's a page that discusses them all:
http://www.microsoft.com/licensing/about-licensing/virtualization.aspx 
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GKaloskyCommented:
It depends on the host version.  If you are running Windows Server 2008 Std edition, that is the single use for that license.  If you are running Enterprise Edition, you get to install 4 VMs of Windows Server (Standard or Enterprise) with that version.
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Syed Mutahir AliTechnology ConsultantCommented:
if you buy Windows Server 2008 R2 Enterprise, you can run 4 virtual machines, your physical instalation must have only one role > Hyper-V and no AD, DNS etc.

If you buy Windows server 2008 R2 Datacenter, then you get unlimited Virtual Servers (Windows 2008, Windows 2008R2, Windows 2003R2)

Do note, that with datacenter edition, you will get two Product Keys :

Physical Key : Only to be used for the datacenter installation on the physical host
Virtual Key : To be used to activate the Virtual Servers, Now the Virtual servers should be Datacenter editions too, in order to be activated with the virtual key you will be given with your purchase.

If you want to use any older OS (2003, 2008) you will have to either speak to your vendor to give you media for that or microsoft (small fee), you can also use your Volume License account with microsoft to get KEYS for those Operating Systems.

I have recently been in a install of datacenter edition and this is what I have discovered so far. All guest VMS should be Datacenter edition in order to use the virtual key provided with the purchase.

But, as this site is not a vendor thus licensing questions should really be pointed towards the vendor, here we can only give you examples of what we have gone through :-)

Hope this helps
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