Connect Outlook to our Exchange Server 2003 over the Internet

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http://serverfault.com – We have a one mail server here on site running Exchange 2003, however we are part of a large exchange group - there are some 10 outlook mail servers around the world and we are just one of the administratove groups. We can access email via OWA and I have checked our server and is a RPC-HTTP Back end server and RPC is installed. We can connect via VPN, on lan, and OWA but I cannot get it to work via the internet. Any suggestions (HowTos)