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Carol Bartz and Steve Ballmer in 2009

Carol Bartz, the fiery Yahoo leader who entered the company into an alliance with Microsoft in an attempt to challenge Google in the Internet search market, is no longer the company’s CEO, reports’s Kara Swisher this afternoon, citing unnamed sources at the company.

No comment on the report yet from the Sunnyvale, Calif., company.

Swisher describes the circumstances surrounding Bartz’s departure as unclear, reporting that CFO Tim Morse has taken the CEO’s job on an interim basis.

Microsoft and Yahoo signed a 10-year agreement in 2009, with the Redmond company supplying the underlying search and advertising technology for Yahoo, aiming to give Microsoft more critical mass to challenge Google. The deal followed Microsoft’s unsolicited and ultimately unsuccessful attempt to acquire Yahoo, then under the leadership of company co-founder Jerry Yang.

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