http://blogs.technet.com/groove/archive/2008/03/26/groove-review.aspxJ. Peter Abruzze has just posted the first of a two part Groove review.  He does a good job explaining when you need Groove Enterprise Services, and when you need Groove Server 2007. Check out the full article at: Getting into the Groove, Part 1:en-USCommunityServer 2.1 SP1 (Build: 61025.2)