I am running a single forest / single domain active directory structure. My DCs are running Windows Server 2003 SP1. Unfortunately, my mail server is has no Windows Server service packs and is running Exchange Server 2003 SP1.
I have found some articles online and a checklist on this site that indicate that I need Exchange 2003 SP2 (and, therefore, Windows Server 2003 SP1 on my mail server) before I transition over to Exchange Server 2007. Is Exchange Server 2003 SP2 a requirement, or just a recommendation before I can do this transition?