Exchange Server 2007 is a powerful messaging platform that fills a critical communications role in many organizations. Subsequently, making an Exchange Server environment both highly available and disaster tolerant is a must. But providing redundancy for all the components of an Exchange infrastructure poses significant challenges, because Microsoft provides for different availability tools and concepts out of the box.
Conceptually, you can divide these challenges into eight logical concepts, each addressed in different ways. Understanding these challenges can help you define which areas of Exchange need particular attention when planning to make an environment highly available.