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Yahoo Inc believes it has "numerous" grounds to appeal a Mexico City civil court's $2.7 billion preliminary judgment against the company, including both errors in procedure and in application of law, a person familiar with the matter told Reuters on Monday.

Yahoo's shares touched $19 Monday, the first time they have traded that high in more than two and half years.

Yahoo (YHOO) announced its first acquisition under CEO Marissa Mayer on Thursday, a New York-based mobile startup named Stamped that was founded by two former Google (GOOG) employees and received financing from celebrities including Justin Bieber.

Yahoo Inc's new CEO Marissa Mayer sketched out her plan for revamping the mobile and search advertising business, outlining publicly for the first time her vision for getting the ailing Web company back on its feet.

Marissa Mayer, who earned a reputation for decisive action and intensity during her 13-year stint at Google Inc, has spent her first months as Yahoo Inc CEO quietly moving the Internet pioneer back to its roots in technology.

Yahoo reported its earnings Tuesday, posting a slight revenue decline to $1.22 billion and setting the stage for a new chapter in the company’s history. The company has been busy in the past quarter, settling a patent spat with Facebook, making a deal with Alibaba, launching a new Axis browser in a mobile push, and completely changing the makeup of its board.

Marissa Mayer's move from Google exec to Yahoo! CEO made her one of the most powerful women in the tech industry. Her announcement just three hours later that she's expecting her first child made her "the most powerful pregnant woman in America," says Lisa Belkin of The Huffington Post.

Yahoo is hiring longtime Google executive Marissa Mayer to be its next CEO, the fifth in five years as the company struggles to rebound from financial malaise and internal turmoil. Mayer, who starts at Yahoo Inc. on Tuesday, was one of Google's earliest employees and was most recently responsible for its mapping, local and location services. Mayer, 37, began her career at Google in 1999 after getting her master's degree at Stanford, the school Google's co-founders attended.

Yahoo Inc. didn't use the occasion of its annual shareholder meeting Thursday to name a permanent chief executive, instead keeping Ross Levinsohn in the position on an interim basis.

Yahoo has been the victim of a security breach that yielded hundreds of thousands of login credentials stored in plain text. The hacked data, posted to the hacker site D33D Company, contained more than 453,000 login credentials and appears to have originated from the Web pioneer's network. The hackers, who said they used a union-based SQL injection technique to penetrate the Yahoo subdomain, intended the data dump to be a "wake-up call."