Every so often I get asked/told “Why tell Microsoft about errors within their products! They will not listen to me.”. Well that is not true, take a look at this email I received from MS Learning about an error I found within one of their books. (70-640)
So sometime in the near future MS will update the errata for this book. So if you find a bug or error that is not covered by the errata for the book, take the time to send an email to publisher about this issue and have it fix/updated.