The Storage Team Blog about file services and storage features in Windows and Windows Server.
Jose Barreto covered details on SMB2 during his TechEd 2008 ITForum presentation. SMB (Server Message Block) is the main protocol used in Windows for file sharing and it has been significantly improved from SMB 1 in Windows Server 2003/Windows XP to SMB 2 in Windows Server 2008/Windows Vista.
See more on the demo results here:
File Server performance improvements with the SMB2 protocol in Windows Server 2008
So, supported in XP? Yea/nay?
Windows XP does not implement SMB2.