SOLEIL synchrotron, inaugurated on December 18, 2006, brings together the whole of the French and international scientific community. It required five years to bring this very high-tech equipment, installed on the Saclay plateau at the heart of a very high-level scientific environment, up to date. With the opening of its first 12 beamlines in 2007, researchers in various disciplines used the highest-performing techniques to gain access to the geometry of the material, as well as its chemical, magnetic, and electric properties.