Also: David Einhorn squeezes Apple for cash; Twitter and Amex saddle up.
Bill Gates’ biggest Microsoft product regret: WinFS [ZDNET]
Einhorn squeezes Apple for cash [THE WALL STREET JOURNAL]
Twitter, Amex to collaborate on e-commerce sales on Twitter [THE WALL STREET JOURNAL]
A match made in the code [THE NEW YORK TIMES]
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