Add windows 2012/ 2008 Domain controller to existing 2003 domain

How to add windows 2012/ 2008 domain controller to existing 2003 domain and synchronize those DC?
litmicAsked:
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Miguel Angel Perez MuñozCommented:
For Windows 2008: before adding DC, must to prepare forest and domain: https://www.youtube.com/watch?v=hIyJkKpUqvw, then run dcpromo and follow directions (simply select domain controller on existing forest/domain)

For Windows 2012: requires nothing, simply install DC role and automatically detects your schema and performs upgrade if requires.

On both cases, full sync is auto when setup completes.
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Cliff GaliherCommented:
Microsoft often has step by step guidance for basic tasks on TechNet. For example, adding a 2012 DC:

http://technet.microsoft.com/en-us/library/jj574134.aspx

If there is a reason you are finding the documentation insufficient, it'll be easier for is to help if we knew where you were getting stuck.
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