when I buy a  license for windows server 2016 datacenter for a virtualization host, I know that unlimited OEM's are licenses on the host. can the OS inside the virtual machine be windows 2012 r2 or windows 2008 r2 also

there is an application we have that still runs on windows 2008 r2. so do I need to buy licenses for windows 2008 r2 also other than the datacenter I purchased for the host. the winodws 2008 r2 will be installed on the same host which is already licenses by windows 2016 datacenter
Aamer MAsked:
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
OEM licensing doesn't allow downgrade rights. You need Software Assurance (or CLP) for downgrade rights.
Sebastian TalmonSystem Engineer Datacenter SolutionsCommented:
Microsoft has different downgrade rights for different product categories:

OEM licenses for Windows Server normally include unlimited  downgrade rights

OEM licenses for client OS only allow N-1 or N-2

OEM licenses for application do not have downgrade as far as I know
Lee W, MVPTechnology and Business Process AdvisorCommented:
Jeremy Weisinger's statement below is incorrect based on his own link:

OEM licensing doesn't allow downgrade rights. You need Software Assurance (or CLP) for downgrade rights.

Rights to server software are granted in the OEM License Terms. The OEM License Terms for most OEM versions released with or after the Windows Server 2003 R2 operating system allow for the user to downgrade to an earlier version. New products that do not have earlier versions do not allow a user to downgrade. See the full text of the applicable OEM License Terms for the specific downgrade rights.

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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Yes, I definitely misread Microsoft info. Sorry about. Should have corrected.
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