Exchange Server 2003 allows Outlook 2003 clients installed on Windows XP Service Pack 1 and above full MAPI client access to Exchange Server 2003 resources using the new RPC over HTTP protocol. RPC over HTTP allows the RPC commands required for full Outlook 2003 MAPI client access to be wrapped or "Encapsulated" in an HTTP header and passed through proxies that allow outbound HTTP/HTTPS (SSL). ISA Server 2000 is the ideal firewall to provide the highest level of protection for the Exchange Servers while at the same time allowing the rich functionality the Outlook RPC over HTTP client provides.
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