Microsoft’s Network Access Protection (NAP) solution was cited as a leader (the top category) in a recent independent report, “The Forrester Wave: Network Access Control, Q3 2008.” Microsoft was one of the many network access control (NAC) vendors invited to participate in the report.
Forrester placed a lot of emphasis on different access control scenarios for the evaluation and the different vendors were evaluated around twelve different scenarios as well as strengths across technology, strategy and market presence.
Microsoft Network Access Protection ships with Windows Server 2008 and Windows Vista and XP SP3, and has a framework that provides interoperability with over 100 different vendors. The NAP statement of health (SOH) has also been adopted as a standard by the Trusted Computing Group’s Trusted Network Connect (TNC)
More information about Microsoft NAP can be found here http://www.microsoft.com/nap