I've tried following directions mentioned on the other posts but I still get the Exchange Authentication failure. I've successfully setup Cisco VPN and can browse the internet using Safari. I've tried getting the server address from outlook and trying it in the server settings and that does not work. I've also tried the url trick outlook.company.com and that too comes back with authentication error. Can someone please help.. Is there something that the administrator has to open. In my opinion if the PC works with VPN then the email client should work too right? Any ideas please.