A while ago we told you about the setup prerequisite change in Exchange 2007 SP1 that allows setup to ignore unreachable domains and domains that do not have any domain controllers running a minimum of Windows 2003 SP1. That post is here:
In this blog post we'd like to fill you in on the details of this prerequisite change and clear up any confusion about how this check actually works.
In supporting our TAP customers in Exchange, we had several cases that went something like this:
Customer: "Hey, I thought SP1 removed the requirement to have a Windows 2003 SP1 DC in all our domains? Setup is failing and telling me I have a domain that does not meet this requirement. We don't have Exchange in that domain, what gives?"
Customer sees this in the setup GUI:
Exchange Server 2007, Service Pack, Setup, Knowledgebase