Before Apple got so paranoid about licensing its operating system software, it tried letting other companies borrow the Newton OS for other devices. Like Sharp’s ExpertPad.
Sharp’s model featured a different case than Apple’s MessagePad, without the rubberized feel, and a side-hinged screen cover like the later 2×00 MessagePad series (check here for good pictures). Software-wise, however, it was just like Apple’s model.
Sharp gave the ExpertPad 4 MB in ROM, 640k in RAM, a 336 x 240 pixel LCD, and the model version went up to PI-7100. The ExpertPad ran Newton OS up to 1.3, but never stuck around long enough to take advantage of the 2.0 OS (though some on the Newtontalk list have wondered).
Luckie’s Newton Gallery says Sharp bowed out of the Newton family because of lack of demand:
Sharp Electronics discontinued manufactering its ExpertPads as well as the Apple models in late 1994. It had expected to make millions in the first year and quietly exited the Newton world due to the poor sales of Newtons in general and ExpertPads specfically.