The AD forest (root and child domains) have now been successfully prepared using /prepareAD and /prepareDomain on the first root DC and the only child DC respectively. This was after a second root DC has been added. Prior to that, netdiag and dcdiag were executed with no reported problems (with DNS or AD for instance). Still a mystery as to why this resolved the previously reported problem. Do you know why?
Test environment now is 2 x root DCs and 1 x child DC and Exchange 2007 Beta 2 is working.
Question: when will the Microsoft Learning curriculum be updated to cover Beta 2? Does it still make sense to take the Ignite or existing MOC 3910A and 3910B Exchange 2007 courses (got no answer from no one from MS so far :-(
Thanks Ninob.