http://blogs.msdn.com/spatdsg/archive/2008/12/10/joining-a-domain-via-smartcards.aspxhttp://technet.microsoft.com/en-us/library/cc721959.aspx undefined A snip from the article: Smart card root certificate requirements for use when joining a domain When using a smart card to join a domain, the smart card certificate must comply with oneen-USCommunityServer 2.1 SP1 (Build: 61025.2)