Okay here is an interesting one... I am running Vista Business on my laptop, and I have the AD User and Computers tools install, with the service packs, + Exchange and LCS. I created a Mail List from my AD User and Computers for our domain. When I access the list again there are no names displayed under the "members" tab. When I goto one of the 2K3 servers and open the mail list from its Users and Computers it displays fine. I forgot to mention that on the Vista machine, if I try to add someone who is alreay a member it displays the error that this user is already a member, so the tool sees the member it just doesn't display them.