From the page linked in Bobette's post:
This morning I went through the train station in Poissy and they had signs posted that they no longer sell the Carte Orange coupon, only the Navigo passes. Signs urging conversion to the Navigo are more prevalent in the metro, and many stations currently have temporary tables or booths where you can sign up. The definitive end of the Carte Orange coupon seems near.
Thanks,
iff. I was hoping that I'd still be able to get by with my old trusty carte orange when I go in a few months. Looks like that won't happen.
Bobette