This document provides an overview of open source and its potential in the enterprise presented by Jeroen van Disseldorp of Capgemini Netherlands. The key points are: 1. It discusses the open source ecosystem including communities, companies, and users and the technological and cultural maturity required to make it work. 2. It presents forecasts for open source growth, with estimates that it will account for 15-24% of the global software market by 2010. 3. It outlines Capgemini's alliance model for partnering with open source vendors and some of their Dutch open source customers from 2008.