Update, I found a document on Microsoft's site. http://www.microsoft.com/technet/prodtechnol/exchange/2003/library/ex2k3 rpc.mspx "Download the Exchange Server 2003 PRC over HTTP Deployment Scenarios Guide" It seems that RPC over HTTP can be don two ways really, a single Server (All-in-one; like SBS), or multiple servers (FE and BE). Unless the "Configuring an Exchange Server 2003 SP1 Single-Server Installation to Use RPC over HTTP" method can be used for people who have one Exchange Server separate from the DC? (shrug) Andrew