i was watching this interesting thread about the history of active directory and its roots going along the activedir.org mailing list. looks like joe captured it here: http://blog.joeware.net/2008/08/11/1420/ if you’re interested in reading it.
while i’m at it, he also posted a link to active directory’s ldap compliance. this is something, i too, lose all the time. so here it is for reference: http://www.microsoft.com/windowsserver2003/techinfo/overview/ldapcomp.mspx