I understand Mac Mail 4.3 is compatible with Exchange 2003, but I'm unable to get it to work. I've tried calling Apple Care and after the guy was quickly stumped, he disconnected me. A previous discussion at the local Apple store informed me that Mac Office 2008 Pro is a less
supported configuration than using Mac Mail so that's the route I took.
When creating an account, I only have the following options on the two systems in question: POP, IMAP, Exchange 2007.
On a third system, I have an additional IMAP Exchange option. I'm not sure where that came from or how to get it. I'm assuming that's the 'connector' needed for Exchange 2003.
If I use IMAP, I get the following error:
"The Exchange IMAP server ... is not responding. Try checking the network connection, and that the server name is correct. Otherwise, the server might be temporarily unavailable. If you continue, you might not be able to receive messages."
All three systems are running Mac OS X 10.6.4 and are behind the firewall with the server on the same subnet. They can ping the server by name (ruling out DNS), by IP and they can make SMB connections. The server is definitely available! They can also get to webmail via the http://server/exchange