the companion books are the best references I have seen packed with real-world experience

a complete reference to planning, deploying, configuring, and troubleshooting Exchange 2000 in any size organization. The book includes step-by-step instructions for important configurations. It focuses on SMTP and helps admins to understand how it works in Exchange. The book is helpful for administrators, IT managers, and consultants that are considering implementation and shows how to migrate from Exchange 5.x to Exchange 2000. It has detailed information and illustrations of how Exchange 2000 works and explains the relationship between Windows 2000 and Exchange 2000.