Paul Thurrott has published a Windows Longhorn Server preview

Though Microsoft has discussed the Longhorn client extensively, it has said very little to date about Longhorn Server, the Windows Server version that will arrive in early 2007. Longhorn Server will extend the technologies found in Windows Server 2003 with Service Pack 1 (SP1) and Windows Server 2003 Release 2 ("R2"), the latter of which is due in October 2005. And like its predecessors, it will offer an evolutionary, rather than revolutionary server platform that builds on past technologies while providing new functionality. Specifically, Longhorn Server won't be completely re-architected or be rewritten in managed .NET code. However, it's likely that Microsoft will dramatically change the Windows Server kernel in this release, breaking compatibility where necessary in order to deliver dramatic new features or new levels of security. Here's what I know about Longhorn Server so far.

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