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.
> SCO's Linux lawsuit made no sense and no one at the time gave it much of a chance of succeeding. Over time it was revealed that Microsoft had been using SCO as a sock puppet against Linux. Unfortunately for Microsoft and SCO, it soon became abundantly clear that SCO didn't have a real case against Linux and its allies.
In a way this was a proxy war of Microsoft vs Linux.
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[0]: https://www.zdnet.com/article/sco-linux-fud-returns-from-the...
[1] https://en.wikipedia.org/wiki/Santa_Cruz_Operation