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The easiest option would be to install a new Windows 2008 R2 server on your existing domain and then promote the server as a Domain Controller.<br />
<br />
AD replication will copy all AD details to the new server.<br />
<br />
You can also do an inplace upgrade from Windows 2008 to 2008 R2, but only if your original server was x64, since R2 only x64.<br />
<br />
You cannot upgrade a 32-bit OS to a 64-bit OS/.<br />
<br />
See discussions on another forum:<br />
<a href="http://technet.microsoft.com/en-us/library/upgrade-domain-controllers-to-windows-server-2008-r2(v=ws.10).aspx" rel="ugc nofollow">http://technet.microsoft.com/en-us/library/upgrade-domain-controllers-to-windows-server-2008-r2(v=ws.10).aspx</a><br />
<br />
<a href="http://social.technet.microsoft.com/Forums/en-US/winserverDS/thread/71203d4a-7f7b-4cf5-adcd-f4b9aeda5bb4/" rel="ugc nofollow">http://social.technet.microsoft.com/Forums/en-US/winserverDS/thread/71203d4a-7f7b-4cf5-adcd-f4b9aeda5bb4/</a>
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The easiest option would be to install a new Windows 2008 R2 server on your existing domain and then promote the server as a Domain Controller.

AD replication will copy all AD details to the new server.

You can also do an inplace upgrade from Windows 2008 to 2008 R2, but only if your original server was x64, since R2 only x64.

You cannot upgrade a 32-bit OS to a 64-bit OS/.

See discussions on another forum:
http://technet.microsoft.com/en-us/library/upgrade-domain-controllers-to-windows-server-2008-r2(v=ws.10).aspx [http://technet.microsoft.com/en-us/library/upgrade-domain-controllers-to-windows-server-2008-r2(v=ws.10).aspx]

http://social.technet.microsoft.com/Forums/en-US/winserverDS/thread/71203d4a-7f7b-4cf5-adcd-f4b9aeda5bb4/ [http://social.technet.microsoft.com/Forums/en-US/winserverDS/thread/71203d4a-7f7b-4cf5-adcd-f4b9aeda5bb4/]

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Hello,<br />
we are migrating from server 2008 to server 2008 R2, how can I make the migration of the domain controller and active directory (users, computers) from the old one to the new one I have no idea how to do it, I would just recreate all users and policies manually but I'm thinking that's just gonna be to much work.<br />
thanks in advanced
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Hello,
we are migrating from server 2008 to server 2008 R2, how can I make the migration of the domain controller and active directory (users, computers) from the old one to the new one I have no idea how to do it, I would just recreate all users and policies manually but I'm thinking that's just gonna be to much work.
thanks in advanced

server migration with domain controler

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.