Active Directory Migration from 2003 to 2012

We are migrating our 2003 DC to 2012.  We have two locations, one in CA and one in TX.
The locations are interconnected via MPLS line at a colo.

The question is:  When we complete the migration from 2003 to 2012 and then decommission 2003, will all the needed settings transfer automatically when migrated (such as subnets, etc...)?
Anthony H.Asked:
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Cliff GaliherCommented:
Active Directory is a full multimaster replicated data store. So anything *in* AD will be replicated as long as you monitor the event logs and ensure replication completes. That includes sites and services (and their defined subnets), group policies, AD objects, etc. But there are plenty of things that aren't in active directory. DHCP doesn't use it. Nor would any DNS zones that aren't  "active directory integrated." so the way you worded your question, the answer is "maybe."  You may have settings and services that aren't a part of AD that you'd consider "needed" or mission critical. We can't be in a position to know.

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Zacharia KurianAdministrator- Data Center & NetworkCommented:
When we complete the migration from 2003 to 2012 and then decommission 2003, will all the needed settings transfer automatically when migrated

Your AD related services, AD objects etc.. will be replicated . But as mentioned by @Cliff Galiher, you have to monitor the event logs and check your AD replication status, AD health etc.. during and after the migration.

Zac.
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Windows Server 2003

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