http://blogs.technet.com/quenguyen/archive/2009/06/15/sccm-2007-client-deployment-using-wsus.aspx* If you have not done so, configure the client workstations (both domain-joined and workgroup) to use the WSUS server (by using Group Policy or registry files) * Enable Client SUP installation method in Site Database / Site Management / <site code>en-USCommunityServer 2.1 SP1 (Build: 61025.2)