These days, Mayer is working hard to change course: She wants Yahoo to be thought of a mobile trendsetter, which is why the company is hosting its first-ever mobile developer conference Thursday in San Francisco.
An expected 1,000 developers will attend. Analysts say Mayer will need to impress them.
"If you're one of the leading Internet assets out there then you have to have a good mobile strategy," said Mark Mahaney of RBC Capital Markets. "That's why Yahoo has to host a mobile developer conference. It has to show that it has mobile chops, not only for consumers and advertisers, but also for developers."