License to upgrade windows 2008

I want to upgrade a server from 2008 standard to 2008 R2 standard.

The server is an OEM license.

Is it possible to do the upgrade with OEM license too? or I need a retail or volume license?

In 2008 server there are installed terminal server licenses, are they valid for 2008 R2?
TEFICOAsked:
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TEFICOAuthor Commented:
We've talk to Microsoft and it's neccesary to buy an OPEN License to upgrade the OEM.

Retail license is also valid but actually it's not possible to find a W2008R2 one.

The question can be closed.

Thanks for your comments.
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QuinnDexCommented:
you will need to obtain an R2 upgrade license as Microsoft class 2008 R2 as a different product not an update to 2008 standard

Microsoft's licensing over view for Windows 2008 R2

http://www.microsoft.com/en-us/download/details.aspx?id=18795
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Ram BalachandranCommented:
Prior to running an instance of Windows Server software (loading it into memory and executing one or more of its instructions) customers must assign a Windows Server license to a physical server. Assignment/reassignment rules for original equipment manufacturer (OEM) licenses are different from Volume Licensing and retail license rights. With a license purchased with a server from an OEM, the Windows Server license is already assigned to that specific server, and lives and dies with that server. The OEM end
customer is not allowed to reassign that OEM license to another server.

Windows Server 2008 R2 Foundation is available through OEMs only on select
single-processor servers. For details on exact server models, please contact the
server manufacturer.
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TEFICOAuthor Commented:
I've talked to Microsoft and find the answer
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