When Microsoft first sued TomTom for patent violations in TomTom's Linux-powered navigation devices, I wasn't sure how much of a fight TomTom would put up. Legally TomTom was between a rock and a hard place. You can't use restricted-use patents in GPLed software.

Centrify and Likewise get sued, having attempted to outdo Free software by faking it and adding software patents to it

Anascape's patent attacks on gaming consoles and ongoing discussions about the the Community Patent in Europe

For some time, we have not heard anything about the patent sellout which Novell inked with Microsoft 11 months ago. Microsoft has since used the deal as the basis for spreading FUD about Linux, with claims that the free operating system could be in violation of as many as 235 patents which Microsoft claims to own.

IT IS ABUNDANTLY clear based on some shallow surveys that Microsoft's patents are often very poor in terms of quality. All sorts of simple algorithms which have been around for decades suddenly have Microsoft claim ownership of them. Here is the latest such example...

A company that was just awarded more than $140 million from Microsoft in a patent-infringement suit has sued the software giant again, this time for alleged infringements in Windows Vista and Office 2007.

Microsoft (MFST) is "indoctrinating" Best Buy (BBY) workers to sell its highly anticipated Windows 7 operating system using outright lies about the performance of open-source competitor Linux, according to Linux experts and at least one Best Buy employee who has seen the alleged Microsoft training slides.

IBM claims that Microsoft did the unthinkable and at least one of its employees argues that Microsoft should be sued for billions after the damage it caused to GNU/Linux through lies from SCO

Apple stifles iPod/iTunes interoperability with GNU/Linux, gets sued over patents, gets advertisements banned for deception