Handwriting recognition - Newton's system was a great idea, but neither the software nor the processing power were up to the job. Effective handwriting recognition remains a significant challenge for today's PCs. Palm selected Graffiti, which isn't true handwriting recognition since it requires the use of stylised forms for letters, but minimised the processor requirements.
DID YOU KNOW THAT PALM PORTED GRAFFITI OVER TO THE NEWTON? IT MAY WELL HAVE GIVEN APPLE ADDITIONAL TIME TO DEVELOP THE MP2X00 MODELS, SEE: http://myapplenewton.blogspot.com/2010/01/jeff-hawkins-newtons-saviour.html
 Simple, out-of-the-box synchronisation with Windows - so that losing your PDA was no longer a world-ending event like losing your Filofax, and content changes made on your Pilot were reflected on your PC (and vice versa).
YEAH, IT WASN'T UNTIL THE MP2X00 MODELS WERE RELEASED THAT IT CAME WITH NEWTON CONNECTION UTILITIES WHICH COULD SYNCH WITH MS SCHEDULE+ AND LOTUS ORGANIZER. SOME PEOPLE WROTE 3RD PARTY APPS LIKE LOOKOUT. NOW OTHERS HAVE WRITTEN MODERN SYNCH APPS FOR MS OUTLOOK FOR WIN 2K, XP, VISTA AND 7: SEE http://usuarios.arnet.com.ar/mtu16/ OTHERS HAVE WRITTEN FOR THE MAC: http://newtonpoetry.com/2009/11/05/newton-connects-with-snow-leopard/