Microsoft will release Windows 7-based tablet computers in time for the holiday season, CEO Steve Ballmer promised a London audience on Tuesday, days after Apple's iPad launched at Target stores throughout the U.S. Separately, Ballmer said Google's Android operating system is not really free but carries a price for its patents. "You do have to license patents. HTC has signed a license with us and you're going to see license fees clearly from Android as well as for Windows," he said in an interview.
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