this is possible but HIGHLY insecure. You would have to setup a separate organizational unit with the ones that you want NO password for. Then create a group policy object for them to have no password length, etc. forced on them. Then link the group policy to that OU. Make sure you set the GPO, (group policy object), so that it does NOT inherit policies. BUT if the domain policy forces inheritance then it still will not work. You would have to make sure that it is not forcing inheritance.