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Back in May, the ask to post a Step-By-Step on Active Directory migration from Windows Server 2003 to Windows Server 2012 was fulfilled and was met with a great deal of interest. Recently an additional ask was put forward to detail migration of Active Directory from Windows Server 2008 R2 to Windows Server 2012. Of course being more than happy to oblige here is said post, however do also take time to notice the similarities and differences between this and the previous step-by-step in migrating Active Directory. It may prove to be the catalyst needed to ensure your organization is always enabled in taking advantage of capabilities such as Dynamic Access Control, Hyper-V replication, Active Directory Recycle Bin improvements, DHCP failover, Virtual Domain Controller and much more.
Step 1: Preparing your existing forest via the adprep command
Insert the Windows Server 2012 DVD into the DVD drive of the Windows Server 2008 R2 AD DS.
Open command prompt, and type adprep /forestprep and press enter.
Check the Schema version of AD DS (After adprep) by running regedit, navigating to Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\NTDS\Parameters and noting the current Schema version.
Step 2: Promoting the Windows Server 2012 Server domain controller
Step 3: Verify the new Windows Server 2012 Domain Controller
Step 4: Transferring the Flexible Single Master Operations (FSMO) Role
Step 5: Removing the Windows 2008 R2 domain controller
As you can see, there are many similarities to migrating Active Directory off Windows Server 2003 and Windows Server 2008 R2. Do take notice though that migrating off Windows Server 2008 R2 takes less steps and is less evasive in terms of uncoupling servers.
What about domain naming master role and schema master role. Don't we need to move those roles as well
i don't think you need to run adprep anymore. server manager will do this for you in 2012.