Sir, I am on self review now for 070-272, Im using the MS Press Book ,Supporting Users And Troubleshooting Desktop Application On Microsoft Windows XP operating System (Self-Paced Training Kit by Walter Glen) ISBN 0-7356-2088-1, which I think the 1st Edition. My question is, Is there a big difference in terms of content with the Second Edition w/c is published on year 2005. Appreciate your sonnest response. Thanks.