jammag writes "Open source advocate Bruce Perens takes a close look at Microsoft's lawsuit against TomTom (discussed here last week), which involves an implementation of the Linux kernel, and calls it essentially a paper tiger. He notes: 'the technologies claimed in the 8 patents involved are so old and obvious that it's fair to say they have a high "Duh!" factor. There's an anti-trust angle to this suit that could blow up in Microsoft's face. And there's a high probability that some or all of the patents involved are invalid, due to recent court decisions.' Although the legal expense for TomTom to defend itself in court could be astronomical — meaning they may be forced to settle — in Perens' view Microsoft is aware its case is weak, yet hopes for a PR victory at limited cost." And reader nerdyH adds speculation from Open Innovation Network CEO Keith Bergelt that Redmond's action could be retaliation for TomTom's spurning a Microsoft acquisition bid in 2006.