We are looking to upgrade our AD to 2008, I have found a couple of guides which I intend to follow, the schema update before this can be done, does this need to be done on all domain controllers or can it be done on the primary domain controller and then it will replicate to the others?
So I would do:
adprep.exe /domainprep /gpprep
Is it worth at this point doing any exchange 2010 preps? as we will be looking to move to this also.