So, in 2011, the only thing of value left in SCO, its Unix operating systems, were sold to UnXis.
The company, now under the name, Xinuos, had no interest in SCO's fruitless lawsuits. Indeed, Kerri Wallach, Xinuos' Sales Manager, said, "We are not SCO. We are investors who bought the products. We did not buy the ability to pursue litigation against IBM, and we have absolutely no interest in that."
That still didn't kill off the lawsuits... until now.
The final obituary for SCO's lawsuits came in a one page agreement between IBM and SCO in the US District Court of Utah. In that document, SCO agreed to a final judgment for "the final resolution of SCO's claims" since "as a practical matter, for the Court to decide the several pending motions concerning IBM's counterclaims, given SCO's bankruptcy and its explanation that it has de minimis financial resources beyond the value of the claims on which the Court has granted summary judgment for IBM."
In ordinary language, SCO had no funds, no case, and neither company has any reason to continue any legal action. In short, stick a fork in it, it's done.
Ironically, since the days of SCO attacking Linux on Microsoft's behalf, Microsoft current CEO, Satya Nadella, has declared that "Microsoft loves Linux."