Battle of the tech titans: Ellison vs. Benioff

November 28, 2011: 5:00 AM ET

FORTUNE -- Fierce competitors need, well, fierce competitors. The latest smack-down? Oracle (ORCL) billionaire CEO Larry Ellison vs. (CRM) billionaire CEO Marc Benioff. Benioff once worked for Ellison, who later invested in, the cloud-computing software company. No matter: Now the two battle for customers -- as well as bragging rights as the world's most visible software mogul. The rivalry is getting testy: Recently Ellison canceled Benioff's keynote at the Oracle Open World conference.

This article is from the December 12, 2011 issue of Fortune

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