Answers the cry of Microsoft Exchange server administrators, covering the migration path and difference between 2000 and 2003 quickly! Written by Microsoft Exchange server experts who bridge the Delta for administrators on the frontline of messaging technology. Includes information on the migration from both Exchange 5.5 and 2000 as well as the use of Outlook 11 and prior versions. Covers Exchange's new and better features: mobile computing, instant messaging, easier Active Directory updates, and more.