Exchange Server 2007 features a new secure role-based architecture like that in Windows Server 2003.
Although a 32-bit version of the beta is available for evaluation, the final release of Exchange server 2007 will be 64-bit only.
Anything you can do from the graphical interface can also be scripted via the new the command-line Exchange Management Shell (EMS).
Users of Outlook 2007 can use the new AutoConnect feature to automate the setup of their Exchange server account.
Among a clutch of new troubleshooting tools is a best practices analyser for Exchange Server 2007.
As well as a new name, the Exchange Management Console has been streamlined and enhanced to make it easier to use.
New wizards launched from the EMC help automate many common tasks.
Add Outlook 2007 to Exchange Server 2007 for maximum functionality.
The enhanced Outlook Web Access client is much more like the standard desktop, but still not an exact replica.