We have a hosted exchange account that multiple iphones connect to with no problem. We have one particular exchange user mailbox that none of the iphones can connect to. I have configured that user's iphone to connect to other mailboxes without issue, but when I try to configure his phone to connect to his mailbox, it fails with the "Unable to verify account information." error. Any ideas on what might be causing this? Google and the Apple techies have been no help.