The Preview Edition is free.
Groove is both a technology and a product.
The main idea behind Groove is that communication must not be always server-centric. The Groove technology enables clients to communicate with each other without an intermediate server. The goal is to provide direct and secure Internet connections for collaboration. Offline work is also possible, changes made will be published as soon as the client is online again, The Groove application contains currently modules for discussions, brainstorming, file services, chat, calendar. Groove 1.0 introduces the functionality to assign roles to users in a shared space, which can be coupled to capabilities.