The most important characteristic of French business culture is the emphasis on courtesy and formality. Titles (Dr, Prof. etc.) should be used both in correspondence and in face-to-face meetings, business contacts are not normally addressed on a first name basis.
I found another really interesting blog written by Melanie Jones from the International Business Times and she has given 8 Cultural Cues that make (or break) a deal. I think that she has created a fabulous list so I have included them below (but for a full explanation or her points I will also add the link to her article at the end of this blog.)