We recently switched one of our users to a Powermac G5 running on OS X. We are using Entourage that comes with Office 2004 from Microsoft. It says that it is Service" release 1 - Version 10.1.4 We are running Exchange 2000 right now, and going to upgrade to 2003 real soon. The user can recieve e-mail from internal and external sources. But he can only send e-mail internally. Any attempt to send e-mail outside the intranet gives an error that the server is not found. Is this something that the newer version of Exchange will solve? or just a configuration error?