In my older mobile device retrospective series, I guess I totally forgot about PenPoint!  Since I was just reminded about its existence again, I thought I'd look it up and see what it looked like (last time I thought about this OS, MacOS 9 was still a thing...).   

PenPoint was a product of GO Corporation and it was one of the earliest operating systems written specifically for personal digital assistants and tablet computing. It ran on AT&T Corporation's EO Personal Communicator as well as a number of Intel x86 powered tablet PCs including IBM's ThinkPad 700T. It would surprise no one that it was never widely adopted. While looking this up, I was also reminded of Amstrad's PenPad (which doesn't run PenPoint).  Pens seemed to be all the rage back then, and the trend seems to be returning these days with current tablets.