http://blogs.technet.com/infrastructure/archive/2007/05/03/sce-rtm.aspxWhat is Essentials? Essentials 2007 is a new management solution in the System Center family of IT systems management products specifically designed for midsized businesses (up to 500 PCs and 30 Servers). Essentials 2007 provides a unified managementen-USCommunityServer 2.1 SP1 (Build: 61025.2)