Re: Surprised they don't use *NIX
SCO was very useful back in the early 90's, it allowed the deployment of commodity hardware into locations where such hardware stood a reasonable chance of being repurposed, given that whilst PC's were 'cheap' compared to pure Unix boxes, they were still expensive for Joe Public...
For some reason putting an unfamiliar or non-MS OS on the box massively reduced the likelihood of the box being either relocated or repurposed to run games etc. - massively increasing systems reliability...