MS-DOS turns 30 years

I'd like to take a moment and recognize the 30-year anniversary of "DOS". Extreme Tech provides this history:

Thirty years ago, on July 27 1981, Microsoft bought the rights for QDOS (Quick and Dirty Operating System) from Seattle Computer Products (SCP) for $25,000. […]

IBM released its Personal Computer in August 1981 running version 1.14 of SCP’s QDOS—but a few months later Microsoft produced MS-DOS 1.24, which then became the standard IBM PC operating system. In March 1983, both MS-DOS 2.0 and the IBM PC/XT were released. The rest, as they say, is history.

And of course, on June 28 1994, we announced the PD-DOS project, which would later become FreeDOS.