This French publication (in French) is reporting that AF knows of ACARS messages from AF447 indicating icing of the probes. There's an AD for the A330 about this starting from 2001 I believe. Can anyone else confirm the existence of these messages?
AVION D'AIR FRANCE DISPARU : Du givre localisé sur les sondes de l'Airbus A330, actualité Société : Le Point