I have a client who has the front-end set as 'compayname'.dnsalias.org, which can be used to access the OWA using '/exchange'.
My problem is with getting the iPhone to synchronise with the exchange server - which seems to be related to the certificate which I have issued from the server. The certificate is self-signed (through CA on Windows Server 2003 for SBS), is a top-level root certificate and contains the principal name 'companyname'.dnsalias.org.
The iPhone itself connects through Vodafone with no problems, can access WAP, Wireless, POP3, Google Mail etc. When the Exchange account is setup (after installing the certificate profile) a message is displayed stating that the Exchange account cannot be verified. All of the user credentials are correct, and the e-mail address is valid and fully functional.
The server is running Exchange 2003 (SP2), which does support PUSH and all of the required settings and forwards are in place.