[Dr. Sivana]

Does it have a 737 Max version?

The whole OS has been a 737Max emulator since DOS 1.0.

[Dalberg-Acton]

I thought MS-DOS version 3.3 hit the sweet spot on capability, performance, and memory usage.
As far as Windows, that honor should go to Windows 2000 (NT ver. 5.0) with no service packs installed. Of course, MS had to hire some adults from DEC to design NT for them.