When you migrate to a Windows Server 2012 domain, install ADMT 3.2 on a Windows Server 2008 R2 server that can operate as the migration computer. You have to have a Windows Server 2008 R2 domain controller in the target environment.Note
If you already specified a Windows Server 2012 domain functional level, and you want the ADMT server to be a domain controller, you can lower the forest and domain functional level by using Windows PowerShell commands. For example, you can use commands that resemble the following:
Set-AdForestMode -identity contoso.com -forestmode Windows2008R2Forest
Set-AdDomainMode -identity contoso.com -domainmode Windows2008R2Domain
Windows Server 2012 implements only one feature, Dynamic Access Control, that has a Windows Server 2012 domain functional level requirement when the Windows Server 2012 domain is configured always to provide claims from all domain controllers. If you do not use this feature, you can lower the functional levels to support previous operating system domain controllers for ADMT migrations. When the migration is complete, you can raise the domain and forest functional levels back to Windows Server 2012.