These other versions of MS-DOS were licensed by PC clone OEMs and bundled with the PC clones. Microsoft didn't sell MS-DOS directly to consumers until later. A

These other versions of MS-DOS were licensed by PC clone OEMs and bundled with the PC clones. Microsoft didn't sell MS-DOS directly to consumers until later. According to https://en.wikipedia.org/wiki/Ms-dos https://en.wikipedia.org/wiki/Ms-dos, MS-DOS 3.20 was the first consumer retail version of MS-DOS (then MS-DOS 5.0 was next).