What does it mean to use “Outlook over the Internet”? Does this open remote procedure calls (RPCs) through the firewall so Outlook clients can connect to Exchange?
No. The option to use “Outlook over the Internet” enables RPC over HTTP in Windows SBS 2003 R2. RPC over HTTP is a new feature in Exchange Server 2003 and in Outlook 2003. Using RPC over HTTP, remote users can enjoy the full Outlook client experience without the need to first establish a virtual private network (VPN) connection. RPC over HTTP wraps the original RPC commands from Outlook into the HTTP protocol, then encrypts them using Secure Sockets Layer (SSL), so all traffic between the remote client and the server occurs over SSL/HTTPS. RPC ports are not exposed to the Internet when using this feature. For more information about RPC over HTTP, see Configuring Outlook 2003 for RPC over HTTP on the Office Online Web site.
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