You're here again?
I'm sure this thread will turn into another 400 post butt-kicking FOR you.
I remember having to beg some companies in Silicon Valley to look at the first Linux distros. Not because of the cost of linux, but because it was a cool idea. We wanted them to port to Linux like they had with SCO. One company laughed at us until they received a machine from us running Linux. Then their attitude changed. The same thing happened with other companies like DPT who made caching controllers.
BTW, Linux isn't exactly cheap anymore. Red Hat's Enterprise products cost a few bucks. But it's good stuff. Heck, I've never had a Linux server kernel panic because of the OS. Years ago we had one Slackware based server that had an uptime of nearly two years and only needed rebooting because we needed to move it.
As far as SCO? I was sad to see them "die" and even sadder to see them morph in to a David Boise litigation company. SCO was at the mountain top and fell off. Bummer.
I notice your chart is from 2000. Caldera (now The SCO Group) didn't buy the UNIX business until 2001, and in the next year they hired a new CEO who changed their focus from maintaining and improving UNIX to being a lawsuit mill. With SCO's mismanagement and lack of focus, I'm not surprised that UnixWare/OpenServer lost marketshare.