Domain 2008R2

I have a testing AD called qa.com running on windows 2003 (DFL=windows 2003)

I need to create a child domain call test.qa.com but with windows 2008 R2.  I have set up this server with DNS and the like.
Question: Is there a need to upgrade the schema to 2008 on the root domain or all i need to do is prep my DC on the new domain?
thanks
cheto06Asked:
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dave_itCommented:
You must upgrade the schema in the forest root before you can create any 2008 R2-native domains.
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Adam BrownSr Solutions ArchitectCommented:
You have to upgrade the Schema to allow for Windows 2008 R2 domain controllers. You do this by running ADPrep/Forestprep in the Root Domain. http://technet.microsoft.com/en-us/library/cc731728%28v=ws.10%29.aspx has info, you should run through that whole thing.
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Mike KlineCommented:
You need to upgrade your schema forestwide /forestprep on schema master and /domainprep on the domains

Note:   if your current DC is 32 bit then use adprep32

One nice thing is that once your child domain is up you can raise the domain functional level to 2008 R2

http://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels(WS.10).aspx
 
You cannot set the domain functional level to a value that is lower than the forest functional level, but you can set it to a value that is equal to or higher than the forest functional level.

Thanks

Mike
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