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Yes you can upgrade to R2 you just need the installation and the key <br />
there also some limitations like itanuim processors need a certain R2 installation<br />
take a look in here for details:<br />
<a href="http://www.mydigitallife.info/2009/07/25/windows-server-2008-r2-edition-supported-and-unsupported-upgrade-paths/" rel="ugc">http://www.mydigitallife.info/2009/07/25/windows-server-2008-r2-edition-supported-and-unsupported-upgrade-paths/</a>&nbsp; <br />

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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/ [http://www.mydigitallife.info/2009/07/25/windows-server-2008-r2-edition-supported-and-unsupported-upgrade-paths/] 


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This is for VM. I wonder if I can download the R2 separately and install.
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This is for VM. I wonder if I can download the R2 separately and install.

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The same just for VM as for psychical machine here is a link for all version<br />
it's depandend on the license you have.<br />
2008 R2 is not for free unless you have an enterprise license and i'm not sure about that to. <br />
<a href="http://www.microsoft.com/windowsserver2008/en/us/try-it.aspx" rel="ugc">http://www.microsoft.com/windowsserver2008/en/us/try-it.aspx</a>&nbsp; <br />

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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 [http://www.microsoft.com/windowsserver2008/en/us/try-it.aspx] 


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<div class="content wysiwyg-content">
I built Windows Server 2008 64bit SP2. &nbsp;Now can I add R2 later and how?<br />
<br />
Thanks.
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I built Windows Server 2008 64bit SP2.  Now can I add R2 later and how?

Thanks.

W2K8 SP2 R2

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.

Windows Networking

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.