Microsoft wants to buy New York-based online advertising firm DoubleClick, according to the Wall Street Journal.

DoubleClick, which is majority-owned by private equity firm Hellman and Friedman, is said to be exploring options and working closely with Morgan Stanley to secure a possible sale with Microsoft.
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A $2bn price tag has been placed on DoubleClick by the private equity firm. DoubleClick, which was founded in 1996 and went private in 2005, has seen revenue of $150m in the last year.