In Pictures: A visual history of OS desktop enviro...
September 18, 1989 – NeXTstep 1.0's introduction was an important one... even if it wasn't, technically, all that revolutionary. This new system contained many user interface features already present in older systems. What made NeXT so interesting was the inclusion of such a wide variety of such concepts coupled with an excellent visual design. Despite these advanced features, the first hardware (and accompanying software) was, unlike nearly every graphical system to ship in the previous half decade, all in black and white. They fixed that later. NeXTstep failed to really catch on... until Apple purchased the company in 1996 and re-used it for a new version of MacOS.
In Pictures: A visual history of OS desktop environments