http://blogs.technet.com/filecab/archive/2008/12/03/file-server-performance-improvements-with-the-smb2-protocol-in-windows-server-2008.aspxJose 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 SMBen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/filecab/archive/2008/12/03/file-server-performance-improvements-with-the-smb2-protocol-in-windows-server-2008.aspx#3164387Fri, 05 Dec 2008 18:29:36 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3164387Carl Chipman<p>So, supported in XP? &nbsp;Yea/nay?</p> http://blogs.technet.com/filecab/archive/2008/12/03/file-server-performance-improvements-with-the-smb2-protocol-in-windows-server-2008.aspx#3164483Sat, 06 Dec 2008 01:09:26 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3164483josebda<p>Windows XP does not implement SMB2.</p>