This book covers the current shipping systems and operations management products from Microsoft. As of this writing, these products include MOM 2005, SMS 2003, MU, and WSUS. While there are older versions of MOM and SMS, we have not covered those technologies in this book in any detail. In addition, this book does not offer any detailed comparison of the current versions of these products to the previous versions. New features in the current products are not explicitly noted.