Mark Minasi, Directory Services MVP, is one of the world's leading Windows authorities. He teaches classes in two dozen countries and is a much sought-after speaker at conferences and industry gatherings. His firm, MR&D, has taught tens of thousands of people to design and run Windows networks. Mark has written more than 25 books for Sybex, including the market-leading Mastering Windows Server 2003 and The Complete PC Upgrade and Maintenance Guide.