W2K8 SP2 R2

I built Windows Server 2008 64bit SP2.  Now can I add R2 later and how?

Thanks.
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Tiras25Asked:
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Darius GhassemConnect With a Mentor Commented:
R2 is not like Windows 2003 R2 this is a full upgrade not just adding extra components. R2 is a fully kernal update. You will not be adding R2 you will be doing a full upgrade on the server

http://en.wikipedia.org/wiki/Windows_Server_2008_R2
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AmnonmCommented:
Yes you can upgrade to R2 you just need the installation and the key
there also some limitations like itanuim processors need a certain R2 installation
take a look in here for details:
http://www.mydigitallife.info/2009/07/25/windows-server-2008-r2-edition-supported-and-unsupported-upgrade-paths/ 
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Tiras25Author Commented:
This is for VM. I wonder if I can download the R2 separately and install.
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AmnonmCommented:
The same just for VM as for psychical machine here is a link for all version
it's depandend on the license you have.
2008 R2 is not for free unless you have an enterprise license and i'm not sure about that to.
http://www.microsoft.com/windowsserver2008/en/us/try-it.aspx 
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
IN 2003 R2 was basically an add-on with some updated technology.

In 2008, they claimed they kept the R2 designation to indicate you wouldn't need new CALs, but what you essentially have:

Vista:2008
Win7:2008R2
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