Outlining Functional Levels in Windows Server 2012 AD DS
Just as Windows 2000 and Windows 2003 had their own functional levels that ensured down-level compatibility with legacy domain versions, Windows Server 2012 has its own functional levels that are used to maintain compatibility.
By default, a fresh installation of Active Directory on Windows Server 2012 DCs automatically puts you into Windows Server 2012 domain and forest functional levels. If you install Windows Server 2012 DCs into an existing legacy domain, however, you are allowed to choose which functional level you want to start the forest in. If an existing forest is in place, you can bring it to Windows Server 2012 functional level as follows:
1. Ensure that all DCs in the forest ...
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