Yahoo seeks Google's aid after Microsoft talks die

But after eluding Microsoft's grasp, Yahoo is now turning to Google to help squelch a rebellion among its shareholders who believe it should have accepted Microsoft's $47.5 billion buyout offer while it was still available last month.

Yahoo announced its decision to let Google handle some of its advertising sales late Thursday, just a few hours after revealing it unsuccessfully tried to persuade Microsoft to renew its previous offer of $33 per share. The snub caused Yahoo to conclude that there is no hope for any kind of deal with Microsoft.

Although Yahoo believes Google could help boost its annual revenue by $800 million, the advertising partnership wasn't enough to ease the disappointment of investors who had been holding out hope for a Microsoft deal.

Yahoo shares fell 85 cents, or 3.6 percent, to $22.67 in morning trading Friday after plunging 10.1 percent a day earlier. Google shares rose $12.96, or 2.3 percent, to $565.91 and Microsoft shares gained 53 cents to $28.77.

Part of the problem for Yahoo is that antitrust concerns might prevent an alliance with Google.

Google already holds about 75 percent of the $11 billion search advertising market in the United States with Yahoo a distant second at 9 percent, according to the research firm eMarketer Inc.

Microsoft and a variety of consumer-interest groups already have signaled they will turn up the political heat in an attempt to prevent Google from working with Yahoo.

The outcry already has drawn the attention of U.S. Sen. Herb Kohl, chairman of the Senate subcommittee on antitrust, competition policy and consumer rights.

"The consequences for advertisers and consumers could be far-reaching and warrant careful review, and we plan to investigate the competitive and privacy implications of this deal further," said Kohl, a Wisconsin Democrat.