In an interview with Fortune magazine published this week, Microsoft's top lawyer, Brad Smith, provided a stark tally of 235 Microsoft patents the company believes are violated by free and open-source software, though he stopped short of detailing any. Specifically, he alleged that the Linux kernel violates 42 Microsoft patents; its user interface and other design elements infringe 65; OpenOffice.org infringes 45; and other packages infringe another 83 Microsoft patents.

Microsoft could have several motives for rattling its patent saber: slowing down open-source rivals, raising fears of open-source legal risks among customers, and winning payment for technology the company believes it deserves from a group that's been generally been unwilling to pony up.
???
Microsoft is a major player in the existing legal and business establishment for handling intellectual property, which includes assets such as patents, trademarks and copyrights. That framework gives considerable power to incumbent companies with large patent portfolios and sufficient resources to pursue more.
???
As an example of what it would like to see, Microsoft points primarily to the Novell patent deal struck last November, in which Microsoft is selling coupons that permit use of Novell's Suse Linux Enterprise Server along with the assurance that Microsoft won't assert its patents against customers. It's unclear how high open-source patent protection is on most companies' priority list, but Microsoft has made a big deal out of the fact that Linux protections are included in two patent-swap deals this year made with Samsung and Fuji Xerox.