New for Exchange Server 2003 Service Pack 1
Microsoft® Exchange Server 2003 Service Pack 1 (SP1) includes a new user interface in Exchange System Manager that enables you to configure your Exchange messaging system to use RPC over HTTP without manually modifying the registry settings. With this new interface, enabling RPC over HTTP for your organization involves doing the following steps:
Configuring your Exchange Server 2003 back-end servers as a target for the RPC proxy servers in Exchange System Manager
Configuring your Exchange Server 2003 front-end servers as RPC proxy servers in Exchange System Manager
To use this new functionality to deploy RPC over HTTP, you will need to install Exchange Server 2003 SP1 on all Exchange front-end servers that will be used as RPC proxy servers. It is also recommended that you install Service Pack 1 on all of your Exchange back-end servers. However, you can enable RPC over HTTP on Exchange Server 2003 back-end servers using Exchange System Manager from another Exchange server that has Service Pack 1 installed.
Benefits When You Have Exchange Server 2003 SP1 Installed on Your RPC Proxy Server
If your RPC proxy server is an Exchange front-end server that is running Exchange Server 2003 with Service Pack 1 or a later version, you gain the following benefits:
Exchange automatically configures the RPC over HTTP proxy component
Exchange automatically configures Internet Information Services (IIS) settings for RPC over HTTP
Exchange verifies that the Exchange servers used for RPC over HTTP meet all the requirements. For more information about requirements for Exchange servers used for RPC over HTTP, see System Requirements for RPC over HTTP on Exchange Server 2003.
Exchange automatically updates the RPC over HTTP proxy component with the Exchange servers to which it can forward requests.