I found this book to be a good road map of an already simple Exchange Administrator interface. There was some information on Exchange, but it was vague and incomplete. For the most part, the reader is told where to set a given setting, but little information was given on the impact of that setting.
The gap between writers was also very transparent. This was very distracting.
There was also some incorrect and confusing information in the book. The section about MS Mail Connector Directory Synchronization Server and requiring a Requestor for each post office is a good example of this. This is not true. Each post office is a requestor, but they lead you to believe you need to install a requestor on the connector for each post office in existence.
Overall, this might be a decent book in preparation to take the test, but you might want to pick another if you want to run Exchange Server.