Directory is a Great Application on Helping you Learn Windows Active Directory, Configuring and also great on Passing the Windows 70-640 Exam. This is a Must if you want the MCTS Certification
MCTS on Server 2008 exam is intended for information technology (IT) professionals who work in the complex computing environment of medium to large companies. The MCTS candidate should have a minimum of one year of experience implementing and administering a network operating system with 250 to 5,000 or more users, three or more physical locations and three or more domain controllers