Though nobody suggested it (probably because a lot of regulars might not know it exists) we *also* have [a dedicated Wordpress site on the Stack Exchange network](http://wordpress.stackexchange.com).

The type of question you're asking ("Is there a way to make Wordpress do `X`?") is probably better suited to that site.  
After following their advice if it doesn't work and you've got a bunch of errors in your AD server's event log Server Fault is the place to bring the follow-up ("I've got Wordpress talking to AD using `X`, but I'm getting error `Y` -- How can I make AD play nice?")

(This is "Good Fragmentation" -- Wordpress experts can point you at the most likely plugins to work for you, and Windows/AD experts can help you if they don't :-)