I know you "join/promote-to-DC" a 2012 R2 Server into an existing Server 2003 Std domain environment, as have already been through that process.
Need clarification as to whether a 2012-R2 Server can be "joined/promted-to-DC" into an existing SBS-2003 domain environment?
I found this thread which said you cannot on an R2 build:
And found this thread that said you can - and "somewhat" confirmed by the MSFT author of this thread: (comments section pg2 - top comment)
If someone could please advise - thanks -