Article today published by ZDNet: Microsoft: No plans to sue over Linux patents
but the question I ask is if their case is strong why would they lose potential revenue and not sue?
MS are such nice guys when it comes competition, aren't they?
My take on this is somewhat cynical. MS can claim things such as Kernel patent violations but to PROVE it in court they would have to disclose in public the Windows Kernel code. This would have two effects - open source windows kernel (which they won't wear) plus a huge number of patent infringment cases AGAINST MS for all the stuff they stole over the years from other people.
I bet you anything there are Linux patent infringements (and certainly MacOS, CP/M, and Gem) in the Windows code not to mention loads of Lotus 1-2-3 infringements in Excel and probably WordPerfect in Word.
Any law suit brought by MS would be an opening salvo in huge war that they would not want to get in on!