I’ve got an Exchange 2003 SP2 server (called Exchange2) with separate front end server called DMZExchange.
I’ve had RPC over http access working for Outlook 2003 OK, but suddenly it seems to have gotten very slow. The connect is OK, and the mailbox even displays the message list in a reasonably snappy manner. But when the user tries to open a mail message, the downloads seem to happen at a few KB/second. Opening a 1Mb message may take over a minute.
I’ve just now been testing this from a notebook which is not a member of the domain but is connected to the local network. If I let Outlook use TCP/IP everything works fine; nice and quick. But if I toggle over to use http for Fast networks (thus forcing RPC over http) everything is slow.
Access via OWA is reasonably good, which would seem to indicate that the http performance of the server is OK.
Looking at the Application event logs on both servers showed nothing related to this.