Originally Posted by Ron Bennett

Even if another company truly has TM rights (I'm not so sure ADP does here; -did you contact an attorney? -have you signed anything yet?), one can often negotiate a settlement in which a particular set of urls / emails will continue to function as redirects well into the future.

Ron

p.s. check out DNForum.com legal forum and/or Namepros.com - you'll find lists of experienced attorneys that specialize in domain name legal issues.