I have set up Instant messaging on my Exchange 2000 server for internal use but get the following error when I try to connect. Signing in to Communications Service failed because the service is temporarily unavailable. Please try again later. I have followed the directions in article Q266643 to set up Instant Messaging and have researched several other articles but cannot find a solution to my log on problems. Does anyone have any suggestions. Thanks, Rodney A. Harris MCP+I MCSE (NT4 & 2k) Network Administrator EPOS Corporation