I have 2 empty root Domain controllers still running Server 2003. One is physical, running Server 2003 R2, 32bit. I didn't think that was possible because I though all R2 versions had to be 64bit. I guess that started with Server 2008 R2. The other DC is a virtual server running Server 2003 SP2(also 32 bit). The physical server holds the Domain naming operation master role. The Virtual server holds the Schema Master role.
Ideally I would like to get them both to 64 bit OS and preferably both to Server 2012 R2. I figure I will put up a new 2012 R2 virtual Server and promote it to DC. I'm a bit unsure of the role migration process. More specifically, Is there a proper order to follow? Schema master first...etc
Is it simpler to upgrade them in-place and keep them at 32 bit since my child domain is already at 2012 domain functional level?