Jan De Clercq is one of HP's lead consultants in the space of Microsoft security. As a Senior Consultant, he is involved in many Windows implementations around the world and is a frequent speaker on the subject at Microsoft and general security conferences. In his HP Security Office member role he focuses on identity management. Jan is based in Belgium. He is co-author of Mission-Critical Active Directory (Digital Press, 2001).Guido Grillenmeier works as a Senior Consultant within the Enterprise Microsoft Services Organization at Hewlett Packard. Based in Germany, Guido joined HP in 1996 and has been working with directories since the early days of Windows NT. Today, he deals primarily with global Windows 2000 deployments and migrations, designing and implementing efficient Active Directory security and delegation models for HP's customers. Guido has been a speaker at Microsoft Exchange and IT-Forum conferences as well as the Directory Experts conferences hosted by NetPro