Mitch Tulloch is the author of over a dozen computer books, including three Nutshells for O'Reilly & Associates, Inc. (Microsoft Exchange Server in a Nutshell, Windows 2000 Administration in a Nutshell, and Windows Server 2003 in a Nutshell), two encyclopedias for Microsoft Press (the Microsoft Encyclopedia of Networking, currently in its second edition, and the Microsoft Encyclopedia of Security), and a string of titles for system administrators from Osborne/McGraw-Hill. Mitch has also written feature articles for industry magazines such as NetworkWorld and Microsoft Certified Professional Magazine, has developed university-level courses in Windows system administration, and provides training and consulting in Microsoft platforms and products. Mitch is based in Winnipeg, Canada, and you can contact him through his web site (http://www.mtit.com).