This is without doubt the worst MCSE book I've read. There were no reviews here when I bought it (worse luck!) but I wish there had been - I wouldn't have wasted a month of my life studying it.It is error strewn (major errors, not just typos, only some of which are mentioned in the errata web site), badly written, disorganised, unclear, full of redundant information and it will - as other reviewers have noted - force you to reinstall AD/Exchange every second chapter if you want to do the exercises.I postponed the 70-284 exam twice as I felt I didn't understand the material even after going through the book TWICE.In the end, believe me, the exam wasn't too difficult. Administering Exchange 2K3 isn't difficult either. This book won't convince you of that.