Migrating from SBS 2000 to SBS 2008
This document written by Microsoft Support Engineer Edwin Joseph describes the process that you should follow to successfully migrate settings and data from an existing server running Microsoft Small Business Server 2000 to a new computer running Windows SBS 2008.
Read the complete post at http://msmvps.com/blogs/bradley/archive/2009/05/02/migrating-from-sbs-2000-to-sbs-2008.aspx