Exchange Server 2003 SP 2 Needed to Transition to Exchange 2007?

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?
tomdevlinAsked:
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plug1Connect With a Mentor Commented:
Even if it wasnt a requirement (which it is) I would do it anyway, you need to SP your 2003 server to SP2 and Exchange.
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isaman07Connect With a Mentor Commented:
There is no direct transition path from exchange 2003 to exchange 2007. You will need to perform a fresh installation of exchange 2007 then migrate the mailboxes and public folders, as well as the master roles to your new exchange server.
Yes you need to install exchange 2003 SP2 before transitioning to exchange 2007.

http://www.msexchange.org/tutorials/Transitioning-Exchange-2000-2003-Exchange-Server-2007-Part1.html
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