Authentication
Smart cards along with user-name/password is most common way to provide 2
factor authentication with microsoft products. Certificates are supported in
this scenario.
For overview of suport look at the article mentioned for the details.
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechnol/windowsserver2003/proddocs/entserver/Best_Connectivity_and_Security.asp
For details about deploying look at
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/topics/smrtcard/smrtcdcb/sec3/smartc10.asp
-Pawan
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