I thought that was Windows XP?
https://www.tomshardware.com/software/windows/ms-dos-and-win...
Although for me personally I would add Windows 2000.
Nobody wanted to upgrade to XP. It was called the Fisher-Price OS because of the way they made the GUI colorful with oversized icons/shapes and rounded corners everywhere.
The old rule of thumb was that every other version was the good one, so people were naturally skeptical of XP (and after having seen ME, who could blame them). Not sure if that holds anymore, or if there is a good one.