The public beta of Entourage for Exchange Web Services is now available.  Exchange Web Services is a modern, robust protocol that enables client applications to communicate more efficiently with the server running Microsoft Exchange Server 2007 SP1 with Update Rollup 4 or later.

Entourage users can now synchronize Tasks, Notes, and Categories with Exchange Server. Recipients can be resolved against the Global Address List (GAL) using EWS/HTTP, and improved AutoDiscover functionality to keep account settings up-to-date after setup.

More info: Full Article | Entourage for Exchange Web Services beta