. . their clients who are locked into SCO Open Server. I have a half dozen or so as clients. Whenever they are forced to upgrade their hardware (usually due to a failure) they need to pay for an update for Open Server so it'll work with the new hardware.

Most are loosely locked in by a license to a run-time package that would cost a pretty penny to relicense for Linux. A few are more tightly tied in. One LIS (Laboratory Information System) vendor I work with depends on the SCO development package to compile their instrument interfaces on-site.

Their main competitor hasn't that tie-in and has long ago moved to Red Hat Linux, but many of their clients are still on SCO due to the cost of relicensing the run-time package.

There's always been some pretty good people over at SCOX but not many left and they're badly underfunded so about all they can do is add a few drivers and adapt open source software packages to work with their Unix.