Windows NT was
OS/2. Check out Torvalds'
story, Just for Fun
dep
That is true...sort of. At the time that NT was developed, OS/2 was a 16-bit OS co-developed by IBM and Microsoft.
They parted ways after OS/2 1.2, and Microsoft developed the sort-of-microkernel-based NT as their 32-bit offering, while IBM took a more gradual approach to removing Microsoft's 16-bit code from OS/2.
[C:\]