Amir’s post about how How Does Entourage Work? is certainly welcome. It outlines, service by service, how Entourage communicates with an Exchange server. It documents the basic traffic, ports used and protocol security.
This sort of thing really should have been part of the documentation for Microsoft Entourage 2004 — at least SP2 in September 2005 — but no matter the timing, it’s extremely useful information now. It explains to both tech support staff and Exchange administrators how Entourage conducts Exchange transactions. It also clears up misconceptions that I’ve come across on the Web, in forums, and in person.