Most of France’s labor unions have called for a day of strikes and demonstrations on Tuesday, September 7, 2010. Although you can never tell for sure until the day of (or the evening before when it comes to public transport), be prepared for major disruptions on the metro, suburban, and intercity trains; schools; government offices (including La Poste): hospitals; and other public services. If you need to be somewhere, start early. And if you have an appointment, call ahead to make sure that your party is planning to keep it. Current plans are for a strike of 24 hours although the unions reserve the right to extend it.
Want to know more? Check out this post from awhile back.