Here are the high level steps which you can use to upgrade the
You can ignore the following message. However, if you are planning to install RODC
later, you need perform ADPREP/RODCPREP first. First Windows 2008 DC cannot be a Read Only Domain
5. If you are planning to decommission the old servers, you need transfer FSMO roles, DHCP
etc to the new server.
Note - You can identify the FSMO role DC information using
Netdom /Query FSMO command.
Reference FSMO -
6. You can remove (demote) a domain controller using DCPROMO command and again, since WS2012 also possible with PowerShell.
Reference PowerShell -
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