From back cover: "Microsoft Exchange Server 5.5 is an industrial strength electronic mail and messaging application system that is on its way to becoming one of the most popular products ever created by Microsoft. learn Microsoft Exchange Server 5.5 Core Technologies provides a practical and comprehensive approach to Exchange Server network design, implementation, and administration. The combination of applied and theoretical information, including step-by-step exercises, makes this book a welcome reference for the system administrator who needs to get the company network up and running, as well as a valuable self-study guide for the Microsoft Exchange Server 5.5 Certified Professional Exam."