Thanks for all
I think we will use chat at "peak simultaneous users". That's why we choose a 4gb RAM server. But it normally won't occure usually. We will customize the server for higher disponibility with your help if possible, and the help of the ENST (Bretagne). September may be a very difficult transition for us between WebCT and Moodle, but we prepare it since april the 12th.
When you speek about A340, i'm sure you know it's the longest plane in the world (in its A340-600 series), more than a Boeing 747. We are very proud of our aeronautic industry, with especially Concorde.