作者简介:Walter Glenn, Microsoft Certified System Engineer (MCSE), Microsoft Certified Desktop Support Technician (MCDST), and Microsoft Certified Trainer (MCT), has been a part of the com-puter industry for more than 17 years and currently works in Huntsville, Alabama, as a consultant, trainer, and writer. Walter is a regular columnist in Microsoft's TechNet Zone and is the author or coauthor of nearly 20 computer titles, including Microsoft Exchange Server 2003 Administrator's Companion (Microsoft