Authors: Jeanette Torres

Justin Sullivan/Getty Images(LOS ANGELES) -- The most serious challenge to Apple's iPad could come on Monday.
Microsoft is widely expected to unveil its own tablet computer, which might include a smaller screen than the iPad, in response to growing consumer demand. 
Last week, the company invited press to a media event in Los Angeles on June 18 for what it said was a “major announcement.”  But since then, Microsoft has stayed mum on the details.

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