An interesting retrospective
I began using Linux as a desktop operating system around 1993, two years after Linux was created. Countless developers, engineers and hackers were doing the same. But at that point, it wasn't what most people would recognize as a desktop OS. The credit for creating and marketing the first Linux desktop designed for ordinary users goes to Corel Corp., which launched Corel Linux OS 10 years ago, in November 1999.
Things didn’t work out so well for Corel; e.g., see this NY Times article: Corel Says Takeover Needed to Prevent Collapse