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Probably some trains, planes and ships from the 90's. At least I remember Cory Doctorow describing airplanes as "flying Solaris boxen with badly-secured SCADA controllers" in his "The upcoming war on general purpose computation".

I watched that presentation earlier today. Interesting how he gave the presentation in 2011 right when smartphones were taking off. I feel like what he's talking about has in part already happened (somewhat) with smartphones, tablets, and chromebooks so ubiquitous now

I know a few places. The answer is, 100% of the time, "legacy code."

One of my former employers has millions of lines of code that just assume a bigendian architecture and play fast and loose with byte order as a result. They are probably not gonna port that code off SPARC any time soon. Eventually. But not soon.

Telcos (and I would expect water and energy companies) support legacy systems whose software only runs in Solaris.