Administration Guide for Microsoft Exchange Server 2003
Microsoft has just updated the document
Administration Guide for Microsoft Exchange Server 2003, which is now in version 4.0. There you can find some hundreds (!) of administration procedures thoroughly described. Definitely a must read!
This guide explains how features work in the Exchange Server architecture, and how to configure and manage these features for optimal results. This content ranges from configuring global settings at an organizational level, to managing individual servers, to managing Exchange clusters. After reading this guide, you will have a solid understanding of what it takes to configure and manage your Exchange Server 2003 organization.