My users are using Windows Mobile 6.1 to access email on our Exchange 2007. Periodically will get prompted for a password, however, we can just cancel and then it's fine. Example: I select Send/Receive, get prompted for password, Cancel, then Send/Receive again and it works. It seems like something wants to authenticate the crecentials, when it's not necessary. How can I stop it from prompting for the password?