We currently have 3 DCs running WS03, all at DFL/FFL WS03. We've installed WS08R2 member servers, one of which is running Exchange 2010 SP1. We've installed one WS12 member server that we would like to promote to DC with DFL/FFL WS08R2, then promote at least one other WS08R2 system to DC, as well. Everything I've read says that, once certain procedures have been performed (testing with dcdiag, repadmin, backup AD, test restore and restore-mode logon/pw), promotion of the WS12 system would make it the primary DC to which FSMO roles would be moved. We would then demote the WS03 DCs, I guess, one at a time. Or, should we demote two of the three DCs, first, then promote the WS12 system to DC? Any help is greatly appreciated.
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