Internally, SCO used to joke that they were “the most popular operating system you haven’t heard of”. It was (at that time) the best Unix on cheap x86 hardware

Internally, SCO used to joke that they were “the most popular operating system you haven’t heard of”. It was (at that time) the best Unix on cheap x86 hardware, so it was deployed everywhere. In gas station pumps, in cash registers, in ATMs, in back office databases. I think SCO made up the majority of Oracle database instances. Most people interacted with SCO code on a daily basis but didn’t know. Of course they rapidly lost the x86 UNIX crown to Linux. At the time I was there SCO could still do a lot of stuff well that Linux couldn’t, but the advantages were rapidly going down and the writing was on the wall.