This is by far the most useful book I've found so far on actual day-to-day administration of Exchange 2000. The book is divided into four well thought out major sections:

• Exchange Administration Fundamentals, which provides an overview of the product and looks in detail at managing Outlook 2000 clients with Exchange.
• Active Directory Services and Exchange, which deals with creating and managing users, mailboxes, contacts, groups, lists templates, permissions, auditing, recipient policies, and system policies.
• Exchange Data Store Administration, covering storage groups, mailbox stores, public folder stores, public folder replication, backup and recovery.
• Exchange Group Administration, which deals with managing the organizational hierarchy, routing groups, administrative groups, message transfer, routing, protocols, virtual servers, maintenance, monitoring, and queuing.

Need I say more? This book covers almost everything. But be warned, it's not written for Exchange novices--you'll benefit most if you've been working with previous versions of the product. 

What is not covered in this book? Planning and deployment issues--I'm still looking for the best book to fill that niche, nothing I've looked at so far has particularly impressed me. I'll keep you informed :-)

I give this book stars out of five. It's not as concise as it might have been if it was published by O'Reilly, but it's very thorough in its coverage and accurate in most places. 

You can find this book on Amazon here.