I am a big fan of the "Dummies" series, as I couldn't have passed my half dozen MCSE tests without their help. I was able to get some information from it, but if I had made it my primary study guide, I don't think I could have bested 55-60% on the exam. I have noticed that everyone else that reviewed this book took the 640-407 exam. This book is supposed to be for the new 507, which is the one I took. This book falls far short in covering the switching and Wan protocols on the new exam. Also, the outpost game on the CD does not function properly. I know two other people that purchase it, and none of us was able to load it. This book will help as a companion, but it should be only a minor player in your study efforts.