Windows Server 2003 Active Directory Upgrade to 2008 R2 with multidomain structure

In an 2003 active directory environment where there are multiple domains
(two sub domains), how to realize the upgrade proccess to windows 2008 r2 active directory? Where to start from? Thanks.
vedyilmazAsked:
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bluemelnConnect With a Mentor Commented:
I just upgraded three domains in a 20-domain forest. I found it easiest to follow the TechNet guide: http://technet.microsoft.com/en-us/library/cc731188(v=ws.10).aspx. It walks you through preparing your existing domain and performing the upgrade. It helps you plan what to do first. Are these two domains the only domains in the forest?

You first need to run adprep /forestprep (as an enterprise admin) to change the AD schema for the forest. Then you prepare each domain by running adprep /domainprep.
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Darius GhassemCommented:
You can technically start within any domain but I prefer to start in the root domain then work my way down to the child domains. You need to run adprep32 or adprep to prep your domain and forest for a Windows 2008 Server R2 to be added as we DC.

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/A_3644-Windows-2008-Server-R2-adprep-adprep32.html
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vedyilmazAuthor Commented:
There is a root domain and two sub domains. I'll carefully read the documents you posted and try in an experimental environment first. Thanks for your suggestions.
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