What I seem to have gathered is that Vista SP1 and XP SP3, to be released in February and March of this year, contain certain features relating to NAC.
These features are one of the major reasons that Microsoft also releases an XP SP3
"...TNCCS-SOH support, already a part of Window Vista, will be part of Microsoft Windows Server 2008 and will be part of Windows XP Service Pack 3. On the TNC side, Juniper Networks has pledged support for TNCCS-SOH and will be moving aggressively to provide interoperability..."
But, really, Sheldon Levine would be (actually IS) the authority on this subject!
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