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I just finished reviewing this book. I looked at it from the perspective of its Windows PowerShell content as I'm a Microsoft MVP who specializes in PowerShell scripting.
PowerShell is becoming more and more important. Under the covers, PowerShell is the basis of all administrative tasks done in the Exchange 2007 Management Console.
PowerShell is new and can be intimidating. However, for anyone who wants to automate tasks and become more productive, they should start investing some time in learning PowerShell. The time will soon come where PowerShell will be the common scripting language used by all Microsoft server products.
What I like about this book is that it isn't too heavy on the PowerShell content, which is good for people new to the scripting language. Concepts are clearly presented, and then there's a small section on how to do the task in PowerShell with an example provided.
Apart from its PowerShell content, the book is very well laid out, and covers every aspect of Exchange that an administrator should know about.
Overall: Five stars.