Ross,
Just running in the first issue because they are not in the default Container: I update my Exchange 2007 SP1 servers to SP2 and the wizard checks also the DC's located in the default DC Container; because no DC is there, a error is displayed and the setup cannot continue. After I moved a DC to the default DC Container everything is fine.
I consider to move the DC's back on your advise. Thanks!
On-topic about the Exch-PDA: It doesn't warn me that the Exch 2007 (4 total) in my organisation havn't SP2 installed... In my Exch2010 training, my teacher told us that SP2 is a requirement... Maybe you have to implement to check this in a new version of the tool?
Arjen