We have a exchange 2010 server and the owa works great. https:// mail.company.com /owa The settings on the phone are pop or exchange owa. I can not get past the authentication on the phone. I have tried all different setting /exchange /owa domain/user /justuser and have gotten no dice. Please any suggestions.

It is possible OWA is being published through an ISA server. BIS does not like that much.