CRJ900 Captain rejected the takeoff at 120 KTS after an Anti-Ice Duct Warning Message appeared. Takeoff was being conducted with wing+cowl anti-ice on.

Narrative

During takeoff with wing and cowl anti-ice on; performed abort at approximately 120 KTS; after Anti-Ice Duct Warning Message appeared (V1 was 137 KTS). Message disappeared prior to exiting runway. Turned off runway with over 5;300 FT of runway remaining; taxied short distance per ATC and stopped. Made PA to passengers; performed QRH procedure; contacted Dispatch and Maintenance then taxied to gate and deplaned passengers. Made log entry and assisted Mechanic. [We] contacted Chief Pilot. Aircraft eventually reassigned to another crew and flight. Wing and cowl anti-ice was on for takeoff in icing conditions; low clouds. After the inbound flight I was aware of extensive icing conditions all along route. [We] did not want to take off into those conditions with anti-ice equipment failures. QRH calls for Wing A/I Off; leave icing conditions. With some experience over the years with this; in back of my mind; knew that we would have to return for landing anyway. I was also aware that we were taking off on a 12;000 FT runway; that we had additional length available over what we typically have; also had favorable wind over 10 KTS right down the runway. With those factors in our favor I made decision to abort.