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Microsoft Office Outlook 2007 and Microsoft Office Outlook 2003 support only the following two remote procedure call (RPC) bindings when Outlook connects to a server that is running Microsoft Exchange Server:
RPC protocol string
Outlook 2007 and Outlook 2003 can connect to a Microsoft Exchange server only by using either RPC over TCP/IP or RPC over HTTP. Outlook 2007 and Outlook 2003 do not try to use named pipes or any other RPC binding method to establish a connection to an Exchange server.
Microsoft Office Outlook 2007, Microsoft Office Outlook 2003, Microsoft Exchange 2000 Server Standard Edition, Microsoft Exchange Server 5.0 Standard Edition, Microsoft Exchange Server 5.5 Standard Edition