I currently have an Exchange 2003 environment with one Front End in the DMZ for incoming email and iPhone/OWA access and a back end server on the LAN that holds the mailboxes.
I have installed a Edge Transport server (not a domain member) in the DMZ to receive inbound email. I have installed a 2010 server on the LAN (CAS, MB, HT).
Currently the Edge Transport server recieves our inbound email and the CAS/MB/HT server on the LAN sends email outbound. I have moved one mailbox as a test to the new server.
My question is how does the iPhone access work moving forward? I don't have an ISA server. Do I just permit the firewall to pass iPhone traffic from the WAN to the LAN server? Or does the Edge Transport server hold a role?