From MSDN Subscriptions, it appears that a Windows Server 2003 Service Pack 1 Beta - Build 1247 (English) was posted to MSDN Subscriber Downloads on November 04, 2004.
Two things. First, its nice to see life go on and Service Packs keep coming out. Secondly, who installs a Service Pack BETA???? I mean, geez, how can anyone afford the time and any organization afford the resources? Whoever they are, God bless them, every one!