How can i setup "Connect to my Exchange mailbox using HTTP" Server/Client side

We have a(1) MS Exchange 2003(sp2) box behind a firewall.
It currently hosts mail for outlook for anyone on the VPN
it also hosts Outlook Web Access (OWA) for those not on the VPN

A few months ago i tried to follow some online documents (now lost) to setup both the exchange server & outlook so i can access emails without connecting via VPN

Does anyone have a guide on what i need to do in a single sever environment so outlook clients can "Connect to my Exchange mailbox using HTTP"

Will we need to open a port up on the firewall?

Thanks
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