HI I've installed on a W2003 SBS Exchance Server. I've got this Problem....several times (i0ve just re-installed it 3/4 times......:() I've installed all correctly, and it seems works correctly....but it's not true....Exhange dont' work....every time..... If I see Event Viewer (System Log) I've no error, Just 2 information that told me that OS start Exchange System Attendant successfully (Origin - Service Control Manager ID Event 7035) and stopped it immediatly (Maybe generated from the error written into the Application Error, listed below) (Origin - Service Control Manager ID Event 7036). Error are logged into Event Viewer (Application Error): here i can see where the system is trying to load Exchange System Attendant (Origin - MSExchangeSA ID Event 9006---DSPROXY.DLL), and it cnat' be able to do it 'cause it generates an error denoimiated "c00700cb" (Origin - MSExchangeSA ID Event 2059). Last error is a WIN32ID error, Exchange System Attendant Error (Origin - MSExchangeSA ID Event 1005). Event viewer told me to install Exvhage SP1, but I can't do it cause if Exchage Supervisor is runnig I can't do anything....... Please help me....I don't wanna to re.install everything yet....and yet....and yet...