> Heck, most people didn't even own mice. You actually had to go out and buy one separately, from Microsoft or IBM if you wanted to run Windows.

You actually could run Windows without a mouse (I did it for a while). The only thing that didn't work was Paintbrush. Everything else was fully keyboard accessible. Every or nearly every menu item and form field had a prominently underlined keyboard accelerator, and you could always rely on the tab order (for form fields) or the arrow keys (for menu items).