Has anyone had the issue where by a user gets multiple requests to login to OWA. Our Connexions and Careers guys have external webmail accounts with the LA and they can't get to them from our site. Everything works fine with our own OWA implementation.
I've checked for anything being filtered, cookie issues and can't find anything. For it to be happening on 2 different OWA sites it must be a client issue but I can't see anything that could cause it.

Any ideas?