Retiring Existing Windows Server 2003/2008 R2 DCs
After the entire Windows Server 2003/2008 R2 DC infrastructure is replaced by Windows Server 2012 equivalents and the OM roles are migrated, the process of demoting and removing all down-level DCs can begin. The most straightforward and thorough way of removing a DC is by demoting it using the dcpromo utility, per the standard Windows Server 2003/2008 R2 demotion process. After you run the dcpromo command, the DC becomes a member server in the domain. After disjoining it from the domain, it can safely be disconnected from the network.
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