Initially I tried to install Exchange 2003 SP2 and the installer said that I wasn't running Exchange 2003 and wouldn't allow me to contiue. When I clicked on properties of the exchange server in system manager it was Version 6.5 build 6944.4 so I looked in the registry under HKLM-Software-Microsoft-Exchange-Setup and checked the newest build and servicepackbuild entries. They still showed the old Exchange 2000 values (this server is an upgrade from SBS 2000 to SBS 2003) I modified those registry entries to 6944 and was able to get the installer to run. The installer seemed to be running ok but then it stopped abruptly and the successful installation screen came up. None of my exchange services restarted so I had to restart them manually and now every email since is stuck in the Messages Awaiting Directory Lookup screen. I have no mail flow either internal or external. This has been going for about 20 hrs. to this point. Please help.