Lunchbocks wrote: » I used Microsoft Self-Paced Training Kit, Microsoft Server 2008 R2 Unleashed, Technet, CBT Nuggets, and Measure Up & Transcender for my practice tests. I studied 2 - 3 hours a day during the week, and 8+ hours a day on the weekends for about 2 months. I would also review what I was studying every night right before bed, and do complete reviews of everything once on the weekends. I have a VMware esxi 4 that I used for my labs, and I labbed a lot. The 640 is not an easy exam. It covers a tremendous amount of information. I am a server admin and have experience with 2008 R2. However, I have no experience in the additional roles like AD-CD, AD-FS, AD-RMS, etc. Those areas took a lot more studying for me. Good luck on your exam!