By Philip Elmer-DeWitt
June 20, 2011

But then, neither is Microsoft gaining on Apple

As measured by market capitalization (i.e., stock price times number of shares) Apple AAPL overtook Microsoft MSFT in May 2010 to become the world’s most valuable tech company.

Apple still trails Exxon Mobil XOM , the No. 1 publicly traded company, by more than $90 billion.

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