Both the 2010 and 2013 PowerShell Cookbooks take the reader on a journey from knowing just enough about PowerShell to find the PowerShell prompts, to achieving fairly complex tasks, while building the appropriate skills along the way.
If you’re an Exchange person and for some reason, PowerShell has passed you by, and how you’re facing having to do something more complex than you’re able to piece together from a search engine result, it may be the right time to retain your marketability and learn PowerShell. With either of these books, learning the skills for Exchange 2010 or Exchange 2013 is achieved in the context of Exchange, which means, much less of learning a script language for the sake of learning it, and much more of getting the job done.
Being a Second Edition, does not mean that you’re required to read the first edition in any way. The reader is taught what they need to know about PowerShell 3.0 and Exchange 2013 while learning real world, task appropriate skills. I have no hesitation in recommending both of these great books.