Are you familiar with IBM's old operating system, OS/2? Most people haven't, we all know that Windows dominated the operating system market in the 90s and it still continues to dominate over other operating systems. Prior to Windows seeing a proper release, Microsoft helped IBM create their own OS called "OS/2" or Operating system/2. Fun fact, apparently Howard Stern liked OS/2 more than Windows 95 and went on a rant about how OS/2 was better on air once.
You can read more about it on the wikipedia article:
en.wikipedia.org







