Having a little issue geting this to work.Server OS = 2003 R2 With SP2Exchange Server 2003 With SP2Configured with no front end server.Followed MS instructions on configuring a server a RPC proxy server.Configure the RPC virtual directory per MS instructionsConfigured the ports in the registry. I have a question about this though... ExchangeServerFQDN is the fully qualified domain name (FQDN) of your Exchange server. If the FQDN that is used to access the server from the Internet differs from the internal FQDN, you must use the internal FQDN. Our employees use a different fqdn to access OWA from home then their outlook is configured to use at work. So i did put our internal fqdn in the registry, what fqdn do i put in outlook for the rpc proxy url, do i use the one we currently use externally? Another question on ports has to do with global catalog server. this is what i did below on the exchange server. To configure a global catalog server to use specific ports for RPC over HTTP when Exchange is deployed in a single-server environment Start Registry Editor. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters On the Edit menu, point to New, and then click Multi-String Value. Name the new registry value NSPI interface protocol sequences. Right-click NSPI interface protocol sequences, and then click Modify. In the Value data box, type ncacn_http:6004, and then click OK. Quit Registry Editor, and then restart the computer.was i not supposed to do this on the exchange server?The final outcome on the client pc in outlook 2007 is this. The connection to microsoft exchange is unavailable. Outlook muct be online or connected to complete this action.Please helpThanksChuck