Estimates on the value of Yahoo's Internet operations have ranged from $4 billion to $10 billion. Properties on the block include Yahoo's widely used email service, digital advertising tools and its still popular finance and sports sites. Credibility suffers; mutiny ahead? Backing Mayer following the flop of her previous turnaround efforts would only alienate investors further, says Mizuho Securities analyst Neil Doshi. "They have lost a lot of credibility," he said. Yahoo's stock has rallied over the past two month amid expectations that it will divest its Internet operations. That would leave Yahoo as a holding company with valuable stakes in China's e-commerce leader, Alibaba Group, and Yahoo Japan. Yahoo shares gained 47 cents to $36.80 in Tuesday's extended trading. Mayer and the rest of Yahoo's board could be ousted if the company doesn't sell and its financial results continue to worsen.