Exo-Dat has been built to prepare the COROT exoplanet observations and to provide the grounds for the subsequent statistical analyses of the planetary systems the instrument is going to detect. Exo-Dat gathers all the data, different in origin, collected for years to prepare the mission profile. It is the results of the intensive observational efforts made, and foreseen to support the exoplanet program of the space mission COROT. It is used to get the information needed for the on-board photometry, help the light curves analyses and to prepare the foreseen statistical analysis of the properties of the exoplanets to be detected in the COROT exoplanet fields.