One of our clients is having an issue getting his Exchange account set up on his iPhone. At first he already had the account in the phone, but needed to re-input his password. It would say password incorrect, even after we reset his password. We validated he could log into webmail and the desktop Outlook client. I've told him to delete and re-add the account to his phone, and now when it goes to verify the certificate, he gets the pop-up that says "UNABLE TO VERIFY CERTIFICATE". I've tried adding the account to my phone and I get the same problem. Any idea what this could be?