Changing domain from SBS 2003 -> 2012 R2

I am in the process or about to create a new local domain and want to know if when I use ADMT should I create a new forest or create the domain in the existing one. The old server is an SBS 2003 and new is going to be 2012 R2. so the functional level is limited in 2003. Never the less I will be eventually removing the SBS server and sticking with 2012 Std versions and newer going forward.

Should I :
Add domain to existing forest
or make a new forest / domain


thanks
andrew sangsteritAsked:
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Gabriel CliftonNet AdminCommented:
SBS is intended to be a standalone all in one server housing your dns, dhcp, exchange and all other roles and does not like other domain controllers or another server taking any of its roles. You might want to create a new domain and add it to your trust.
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andrew sangsteritAuthor Commented:
that's what I was doing but I still want to know if I am adding the new domain to the forest or creating a new one. the oldest functional level I can go with 2012 is Server 2008.

hmm..
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Gabriel CliftonNet AdminCommented:
The few times I have migrated from sbs to full servers, I have always just created a new domain with a few test machines and when everything was ready to go I switched all computers to new domain. It can be much cleaner considering new domain, no old computers or group policies. ForensIT has a great profile transfer wizard that can help you keep your user data on workstations when you make the move. The domain functional level will be of the oldest domain controller on your new domain.
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andrew sangsteritAuthor Commented:
ADMT will do the same but have you tested it from SBS -> 2012?
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Gabriel CliftonNet AdminCommented:
I have not done this since server 2008. But that should really not matter in that if you are making a new domain the only thing you need to do is make sure all user profiles are created, all group policies are in place and files are copied from one server to the other.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
It seems Gabriel is mistaken or misleading.  SBS permits additional DCs in the domain - that would be my recommendation, add the 2012 server to the SBS domain and migrate.  You CANNOT add additional domains to an SBS domain - Forests are not possible.  SBS MUST be the FSMO master and cannot have trusts.
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