• Ratcheting up the growing rivalry between Google and Microsoft, Google will join a European Union antitrust case against Microsoft that claims the company is stifling competition in the web browser market by including Internet Explorer in Windows.

• Microsoft filed a suit of its own, alleging that in-car navigation system maker Tom Tom is violating eight of its patents, including three relating to Tom Tom’s use of open-source operating system Linux. This is believed to be the first time Microsoft has filed suit over Linux, which it has repeatedly said violates its patents.

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