Yahoo CEO facing possible rebellion after spurning Microsoft

Analysts and investors were left to wonder why the two sides couldn't compromise at $35 per share.

"They really didn't seem that far apart," Chervitz said. "There is probably blame to go around on both sides, but I think most of it is in Yang's hands."

To win the faith of shareholders, Yang will have to execute a turnaround plan that he began drawing up nearly a year ago after he replaced Terry Semel as CEO amid shareholder angst about the company's financial malaise.

Ballmer also will be under the gun to prove he can come up with another way to challenge Google's dominance of the Internet's lucrative search and advertising markets.

The unsolicited bid was widely seen as Ballmer's admission that Microsoft needed Yahoo's help to upgrade its unprofitable Internet division.

Analysts now expect Ballmer to use the money he had earmarked for the Yahoo acquisition to explore other possible deals with large Internet companies like Time Warner Inc.'s AOL and News Corp.'s MySpace and promising startups like Facebook Inc. and LinkedIn Corp. Microsoft already owns a 1.6 percent in Facebook, the second-largest social network behind MySpace.

But Ballmer is unlikely to be under as much duress as Yang, 39, who has promised that Yahoo's development of a more sophisticated and far-flung Internet advertising platform will produce net revenue growth of at least 25 percent in 2009 and 2010.

That would be a dramatic improvement, considering that Yahoo's revenue rose by 12 percent last year and is expected to grow at about the same pace this year.

Analysts, though, are skeptical about whether Yahoo will be able to hit those targets, raising the chances for a shareholder rebellion if the company stumbles in the next two quarters a distinct possibility if advertisers curtail spending in a shaky U.S. economy, as many analysts fear.

As it is, Yang and the rest of Yahoo's board almost certainly will face more lawsuits from incensed shareholders.