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migrating AD 2003

I recall reading somewhere that you cannot migrate AD from a 2003 to a 2012 OS environment, that you must first upgrade to 2008 and then 2012. I'm not sure if this is correct. Can anyone please clarify? To be more specific we have 2, 2003 domain controllers and we want to buy 2 new servers to install 2012 on and then migrate the roles over. I just want to know if we have to go through installing 2008 first and migrating AD from 2003 and then upgrading the OS to 2012 from 2008.
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Ted Pezzullo
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Ted Pezzullo
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Will SzymkowskiSenior Solution ArchitectCommented:
I recall reading somewhere that you cannot migrate AD from a 2003 to a 2012 OS environment, that you must first upgrade to 2008 and then 2012. I'm not sure if this is correct.

This is not true. In order to have 2003 and 2012 domain controllers co-exist,  you need to have a Forest and Domain Functional Level of 2003. You then need to prep the domain and forest for 2012 and then you can promote your 2012 servers as DC's. You can then transfer the roles to the new 2012 servers.

You do not need to go to 2008 and then 2012.

Will.
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jekautzCommented:
There are two different things to note here when having this conversation.  There is the DC OS and there is the domain/forest functional levels.

I recently had a 2003 domain/forest with a 2003 server DC.  I added a 2012 server to this domain.  Nothing difficult.  Just add the 2012 to an existing domain during the dcpromo.  

When I retired and removed the 2003 server from the domain I was then able to raise my functional levels to Windows Server 2008 R2.
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it_saigeDeveloperCommented:
Along with what Will and jekautz have already stated, there are a couple of other potential gotchas to look out for:

1.  You may have to modify the component services on the 2003 DC before ADPREP will successfully run:

http:/Q_28584877.html#a40514872

2.  Kerberos authentication can fail intermittently (Microsoft has a hotfix for this issue) -

http://blogs.technet.com/b/askds/archive/2014/07/23/it-turns-out-that-weird-things-can-happen-when-you-mix-windows-server-2003-and-windows-server-2012-r2-domain-controllers.aspx

-saige-
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