I also have a Newton, and as far as I know, it would sync with the Claris Organiser. Also with Claris Works? Possibly the word processor and spreadsheet using Mac OS 9 or Classic and Newton Operating System (NOS) 2.x And what kind of connection device (cable) I would have to use to connect the Duo and a Newton? A Mac Din-8 serial printer cable will do from the Duo's serial port to the Newton's Interconnect port via the adapter (MessagePad 2x00 series) or just to the serial port on the MessagePad and MessagePad 1x0 series. If your budget allows it, Ethernet will communicate using a hub between the Duo's ethernet port (Duo Dock or third party Etherdock) and the MessagePad (NOS 2.x). The Newton Internet Enabler does not support combo cards. Try a card such as the Farallon PN595 which is just 10-BaseT Ethernet. This type of connection offers faster data transfer than a serial connection. Also, visit the Newtontalk list http://www.newtontalk.net/ - sir izaac