When HP came out with the app l-print to work with the iPad, I Down loaded it and purchased the printer HP said to use. Now, after upgrading to 4.2.1 I find out that the printer I purchased for the HP i-print will NOT work with AirPrint, because the printer HP coded to work with AirPrint will not work on the printer that works with THEIR i-print....I. think this is UNFAIR to the people that have been with Apple and HP all these years......Any solution that will NOT cost me more money