Please keep in mind while reading this FUD-ridden, one-sided "opinion piece" that Microsoft, the darling of Pointy Haired Bosses worldwide, doesn't provide any indemnity to its customers either!
It has been proven in court that MS has misappropriated copyrighted materials from many of its former competitors and "partners", while SCO has revealed no evidence whatsoever that incriminates the Linux kernel. (The Linux kernel is so well documented that it'd be easy to determine who introduced the contoversial code and when. Plus, SCO has no claim over SystemV either, as that's been tainted with BSD code.) Also remember that IBM has more patents and a larger legal department than most other countries combined! I definitely know which side I'd bet on if I were a betting man...