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SAN FRANCISCO - When Yahoo Inc. holds its annual meeting July 3, expect fireworks from irate shareholders seeking retribution for the company’s decision to remain independent instead of accepting a $47.5 billion takeover offer from Microsoft Corp.

The first signs of outrage flared Monday as Yahoo’s stock plunged 15 percent in reaction to Microsoft withdrawal of its sweetened $33-per-share bid and two lawyers already suing the company’s board vowed to amend their complaint to account for a “massive loss in shareholder value.”

The breaking point in the 3-month standoff occurred over the weekend when Yahoo co-founders Jerry Yang and David Filo met with Microsoft Chief ExecutiveSteve Ballmer after he had agreed to raise the software maker’s bid by about $5 billion, or more than $3 per share. Yang and Filo said Yahoo’s board wanted $37 per share — a price the company’s stock hasn’t reached in more than two years.

In response, Ballmer pulled his offer off the table.

In an interview Monday, Yang indicated he had expected Ballmer to counter.

“We engaged with them and we wanted to find a way to get something done. But they walked,” said Yang, who was named as Yahoo’s chief executive officer 11 months ago.

If he wants to remain CEO, Yang probably will have to show his turnaround strategy is compelling enough to propel Yahoo’s stock beyond $33 per share within a year.

Yang has promised that a more sophisticated and far-flung ad network will accelerate Yahoo’s net revenue growth by at least 25 percent in 2009 and 2010, up from the recent pace of 12 percent increase.

“The company is doing better than three months ago,” Yang said Monday. “I think in many ways this (takeover threat) has been good for us. We still have a lot of work to do to demonstrate that we can be successful, and I am focused on that.”

But Yang’s credibility has been undermined by Yahoo’s repeated forecasts of better times ahead while its profits steadily eroded during the past two years.

“We are not willing to give (Yahoo) the benefit of the doubt that they can make meaningful improvement over the next three years,” UBS analysts Benjamin Schachter, Heather Bellini and Abhey Lamba wrote in a joint research note.

If Yahoo stumbles, that could entice Microsoft to return with another takeover bid that would be more difficult to turn down.

Venture capitalist Todd Dagres of Spark Capital likened this approach to a crocodile’s.

“Rather than try to eat its prey while it’s warm and tough, (Microsoft is) dragging it down to the bottom of the river, sticking it under a rock and eating it later when it’s cold and soft,” he said.

Although Microsoft has publicly indicated it will focus on measures besides buying Yahoo in its effort to make its Internet division profitable, several analysts predicted the software maker will revive its offer in the summer or fall if Yahoo doesn’t snap out of its two-year funk — the weakness that exposed it to an unwanted takeover in the first place.

“Should the frustration of (Yahoo) shareholders come to a boil, we believe (Microsoft) could re-enter the picture, essentially playing the role of the white knight,” analyst David Hilal of Friedman, Billings, Ramsey & Co. wrote in a Monday research note.

With similar opinions reverberating through the stock market, Yahoo’s stock didn’t sink as dramatically as many analysts anticipated. But Yahoo shares shed $4.30 to close at $24.37, wiping out nearly half the gain they had made since Microsoft made its bid Jan. 31. The drop left the Sunnyvale-based company’s market value about $12.5 billion below Microsoft’s last offer.

Yahoo’s stock price was $19.18 before Microsoft made its offer.

“I was expecting to see a more extreme reaction” to Microsoft’s withdrawn bid, Stanford Group analyst Clayton Moran said. “Microsoft is trying to make it seem like it’s not coming back (with another bid), but this somewhat muted reaction shows the market isn’t buying it.”

If Microsoft returned with a “real offer and a real proposal,” Yang said, “we would be happy to listen.”

Yang figures to get an earful from irate shareholders at the annual meeting. Yahoo finally set the meeting for July 3 after indefinitely postponing it in early spring as part of its effort to foil a possible hostile takeover attempt by Microsoft.

Now it may be Yahoo’s shareholders who try to oust Yang and the rest of Yahoo’s board instead of Ballmer, who had threatened an attempt to dump the 10 directors if they didn’t accept Microsoft’s offer.

Lawyers for two Detroit-based public pension funds that sued Yahoo in February, alleging it failed in its duty to act in shareholders’ best interests, will amend their complaint to include the weekend’s events, according to a statement Monday from the firm, Bernstein Litowitz Berger & Grossmann.

Meanwhile, Google Inc., whose dominance in online search triggered Microsoft’s bid, appears poised to grow even stronger.

Unnerved by the prospect of its two biggest rivals joining forces, Google reached out to Yahoo to help thwart Microsoft’s bid.

The collaboration has prompted Yahoo to consider turning over some of its advertising space to Internet search leader Google, whose technology yields higher profits from commercial links. If Yahoo announces an ad partnership with Google, that could preclude a renewed bid from Microsoft because Ballmer thinks the alliance will diminish Yahoo’s long-term value.

Many analysts share Ballmer’s opinion. While Google could boost Yahoo revenue by anywhere from $850 million to $1.6 billion annually, it might also hurt Yahoo by undercutting the appeal of its own ad platform.

An alliance between Google and Yahoo also would cause regulatory headaches because antitrust officials would to take a hard look at the partnership because the companies combined control more than 80 percent of the Internet’s search advertising market.

While analysts debated how Yahoo and Microsoft should proceed, most agreed Google will benefit from the aborted takeover attempt.

Even if Google doesn’t end up selling ads on Yahoo’s heavily trafficked Web site, it has kept some of the Internet’s biggest services out of Microsoft’s clutches.

“We believe Google is a major winner given the failure of the Yahoo bid,” Stifel Nicolaus analyst George Askew wrote in a Monday note. “Google is well positioned to continue to gain market share, benefit from any Yahoo (advertising) deal, and exploit any ongoing chaos at Yahoo and Microsoft.”

Google shares gained $13.61, or 2.3 percent, to close at $594.90 Monday.

Time Warner Inc. also appears to be in a better negotiating position if it decides to sell its struggling AOL subsidiary, as many analysts anticipate.

Yahoo had been mulling a possible combination with AOL’s online operations as a defensive measure against Microsoft. Now, Microsoft may make a run at AOL if it’s interest in buying Yahoo is truly dead. And if Microsoft enters the picture, Google might offer to increase its 5 percent stake in AOL just to repel Microsoft.

A long list of Internet startups also could be in line for big windfalls if Microsoft and Yahoo step up their efforts to acquire more online weapons to challenge Google. And if Microsoft and Yahoo go shopping, Google has plenty of cash to get into bidding wars for potential takeover targets like Digg Inc., LinkedIn Corp. and Facebook Inc.

“Freed of one another, Yahoo and Microsoft are buyout prospectors: we would expect a rush-to-deal environment,” BMO Capital Markets analyst Leland Westerfield.

Most analysts believe Microsoft has to make some kind of bold move after its online division lost $745 million through the first nine months of the company’s fiscal year.

“Any notion of simply returning to the original, pre-Yahoo strategy is likely to be insufficiently defined and credible,” Bernstein Research analyst Charles Di Bona wrote in a Monday note.

In a mild surprise, Microsoft shares fell 16 cents to $29.08 Monday. Most analysts thought the stock would climb because investors had driven down the shares during the last three months on worries that a Yahoo takeover would turn into an expensive mess.

SAN FRANCISCO - Yahoo Inc. and McAfee Inc. are joining to offer alerts about potentially dangerous Web sites alongside search results generated at Yahoo.com.

With the new security feature — slated to take effect Tuesday — people who search the Internet using Yahoo will see a red exclamation point and a warning next to links McAfee has identified as serving dangerous downloads or using visitors’ e-mail addresses to send out spam.

Dangerous downloads can include “adware,” which shows unwanted advertisements; “spyware,” which secretly tracks users’ keystrokes and other actions; and other malicious programs that can give criminals control over users’ computers.

Yahoo and McAfee hope the move will quell users’ anxiety about accidentally clicking on malicious links.

“Yahoo users have clearly told us that among the most important concerns for them are all these lurking threats on the Internet,” said Priyank Garg, director of product management for Yahoo’s search division. “They know the damage they can do but they don’t know how to protect themselves.”

Yahoo has decided to simply nuke the worst offenders — sites that attempt “drive-by downloads,” or trying to automatically install malicious code on visitors’ computers by exploiting coding flaws in their Web browsers.

If McAfee has identified a site as having employed such tactics, Yahoo users won’t see the link at all.

“When a user gets a set of search results, there’s really no indication of who’s a good guy and who’s a bad guy,” said Tim Dowling, vice president of McAfee’s Web Security Group. “You’re really leaping off a platform of faith that you’re clicking on a site that’s safe and not one that’s bad. And the bad guys really try hard to look good.”

The companies declined to reveal the financial terms of the partnership.

The deal represents the latest attempt by Sunnyvale-based Yahoo to lure more search requests, snap out of its recent financial funk and steal advertising dollars from search leader Google Inc. as it tries to justify its rebuff of Microsoft Corp.’s $47.5 billion takeover bid.

Yahoo shares fell 15 percent Monday after Microsoft pulled out of merger talks over the weekend.

After Google, Yahoo operates the second most popular search engine among U.S. users, with 21 percent market share compared to Google’s nearly 60 percent, according to data for March, the latest available, from comScore Inc.

The deal gives Santa Clara-based McAfee a way to expose more Internet users to its security software and tempt them to upgrade to premium versions.

McAfee also benefits from teaming with Yahoo because it can use Yahoo’s search data to identify sites to examine for security holes and include within its products, McAfee’s Dowling said.

The McAfee technology being used on Yahoo’s site is a stripped-down version of McAfee’s full SiteAdvisor technology that also is available for free directly from McAfee. It uses red, yellow and green icons to label safe and harmful sites. A premium version adds other features.

Billions of sites have harmful content, and the criminal hackers behind them try relentlessly to manipulate search rankings to boost their links and ensnare more victims.

Yahoo’s Garg said the company was doing experiments to identify malicious sites and bar them from search results.

But he said “security is not Yahoo’s forte” and McAfee’s technology gives Yahoo the breadth and depth “many orders of magnitude greater than what we had before.”

SEATTLE - Microsoft Corp. said late Monday it will now sell TV shows, including popular NBC series, on the Zune Marketplace, a move that brings its selection of content for the digital media player a step closer to what Apple Inc.’s iTunes offers for Apple’s much more popular iPod.

Redmond, Wash.-based Microsoft said it also planned to send out software updates overnight that add new features to the Zune devices and the PC software used to buy and manage digital content.

Microsoft ventured into downloadable video sales for Zunes last October when it released its second-generation players and software, but the content was limited to music videos.

Starting Tuesday, Microsoft will sell episodes of TV shows including Comedy Central’s “South Park” and Sci-Fi Channel’s “Battlestar Galactica” for $1.99 each.

In a small victory over Apple, Microsoft said the Zune Marketplace will also carry NBC shows including “The Office” and “Heroes.” NBC Universal has said it pulled its shows from iTunes over Apple’s unwillingness to set different prices for TV shows.

Microsoft spokesman Jason Reindorp said flexible pricing is within the scope of its agreement with NBC, but that there are no concrete plans.

The software maker still has a lot of work to do to catch Apple. Since the first Zune went on sale in November 2006, the software maker has sold “just north of 2 million” of the devices, Reindorp said. Apple sold 10.6 million iPods in the first three months of 2008 alone.

But the Zune offers some capabilities the iPod doesn’t. One Microsoft is betting on is its Zune Pass subscription service, which gives users access to every song in the catalog for $14.99 per month.

Reindorp said TV shows aren’t available as part of the subscription service yet, but that Microsoft is looking this year at making Zune Pass less expensive or including more content in the monthly fee.

Zunes can also synchronize wirelessly with PCs, something iPods and Macs can’t do. Users can plug a Zune into its charger anywhere in range of their home Wi-Fi network and the device will update itself automatically.

One of the software updates planned for Monday night will make it possible to synchronize several Zunes wirelessly and simultaneously with the same computer. Another lets users sitting at their PCs choose new content to send to a Zune next time it’s in range. Before, a Zune’s user had to connect the device to a PC — wirelessly or with a cable — to tweak its contents.

Microsoft’s service also emphasizes the social aspect of music consumption and includes services to help users tap into their friends’ music discoveries. After the update, Zune Pass subscribers will be able to easily send the contents of friends’ “Zune Cards,” or mini-profiles showing favorite tunes and recently played tracks, to their own Zunes.

Other new features include gapless music playback and playlists that automatically update themselves based on criteria set by the Zune user.

Reindorp said the software update was widely tested among Microsoft employees.

___

On the Net:

http://www.zune.net

QUITO, Ecuador - Ecuador’s president has agreed to renew the operating concession for the local unit of mobile phone giant America Movil.

Ecuador’s National Telecommunications Secretary Jamie Guerrero says America Movil’s local unit, Porta, is willing to pay the price requested by Ecuador’s government to continue operating in the country for 15 years.

Guerrero says the decision came Monday as America Movil President Daniel Hajj Aboumrad met with President Rafael Correa. It must still be approved by Ecuador’s national telecommunications commission.

Ecuador had sought US$480 million (euro310 million) for the concession, although Guerrero did not confirm its final price.

NEW YORK (Billboard) - Stricken with acute laryngitis, Avril Lavigne has postponed six upcoming U.S. tour dates, according to a message on the pop-punk musician's Web site.

The postponements were announced Sunday evening (May 4) and follow cancellations of shows in Phoenix and San Diego. All the dates were part of Lavigne's in-progress “Best Damn Tour.”

A statement from Lavigne on her site reads, “My sincerest apologies to all of my fans. My intention was to complete the rest of the tour but tonight at sound check in Anaheim I realized this wasn't possible.”

Refunds will be available at point of purchase starting Monday (May 5). It is not clear when, or if, the postponed dates will be made up.

Here are Avril Lavigne's postponed tour dates:

May 3: Anaheim, Calif. (Honda Center)

May 4: Universal City, Calif. (Gibson Amph. At Univ. CityWalk)

May 6: Santa Barbara, Calif. (Santa Barbara Bowl)

May 7: San Jose, Calif. (HP Pavilion At San Jose)

May 9: Spokane, Wash. (Spokane Arena)

May 10: Everett, Wash. (Comcast Arena/Everett Events Ctr.)

Reuters/Billboard

NEW YORK (Reuters) - Reports of a possible sale of Sprint Nextel Corp (S.N) to Deutsche Telekom AG (DTEGn.DE) or a Nextel unit spinoff raised hopes of a reprieve for the embattled mobile operator, lifting its shares 10 percent.

But analysts said such deals would be difficult. A Deutsche Telekom deal would require integrating incompatible networks and face a tough antitrust review and a Nextel spinoff would also mean an overhaul of billing and retail operations.

A source close to Deutsche Telekom told Reuters on Monday that the company had been looking at Sprint since it announced a huge write-off in February. German magazine Der Spiegel had also said Deutsche Telekom was eyeing a takeover or merger.

The Wall Street Journal said Sprint was considering spinning off or selling its Nextel unit and that said Cyren Call, a company founded by Nextel founder Morgan O'Brien, was trying to assemble a group of investors.

“The spinoff of Nextel would be very complicated,” said Stifel Nicolaus analyst Chris King.

“Other than the cheap dollar I can't find a logical reason Deutsche Telekom would have an interest in a poorly performing U.S. company with a different technology,” he said.

Aside from its floundering share price, M&A speculation has also arisen from Sprint's search for funding to support its costly investment in WiMax, an emerging high-speed wireless technology it has said it will use for an advanced network.

Sprint is close to a long-expected deal to create a WiMax joint venture with Clearwire Corp (CLWR.O) with $3 billion funding from cable companies, Intel Corp (INTC.O) and Google Inc (GOOG.O), a source familiar with the matter told Reuters.

King said that of the various possible deals, this was the most likely to succeed.

Sprint shares closed up 10.5 percent on the New York Stock Exchange, at $8.72. Deutsche Telekom, which also declined to comment, saw its shares fall 1.5 percent to 11.61 euros.

NEXTEL WOES

Sprint's market value has fallen 66 percent since it bought Nextel Communications for $35 billion in 2005.

Its main problem has been subscriber losses amid customer service and network problems. Nextel's iDen network is incompatible with Sprint's CDMA network. Deutsche Telekom's T-Mobile USA uses yet another mobile technology known as GSM.

Sprint spokeswoman Leigh Horner declined to comment on the reports, but said the company was committed to maintaining the iDen network, saying “it represents a key differentiator.”

Chief Executive Dan Hesse told Reuters in early April he was not actively looking for a buyer for the Nextel assets but would evaluate any offers.

Pacific Crest analyst Steve Clement said it was unclear what the Nextel business would be worth to anybody besides Sprint, which recently took a $29.7 billion goodwill write-off related to the Nextel purchase.

“I don't know how feasible it is and how much value that business would have to anybody else given the level of integration with Sprint (Nextel) has gone through and the lack of a strategic future,” he said, noting that iDen has no upgrade path for high-speed Web services, a key to future growth in cell phone services.

A Nextel spinoff could make it easier for Deutsche Telekom to buy Sprint, as iDen would be eliminated, but T-Mobile USA and Sprint would still have two separate network technologies.

“That makes it a little bit clearer, but you still have incompatible technologies and the experience with Sprint Nextel says that's not easy to do,” said Clement.

Assuming Sprint Nextel stays intact, a merger with Deutsche Telekom's T-Mobile USA would create the biggest U.S. mobile service provider in terms of subscribers, surpassing AT&T Inc (T.N) and Verizon Wireless, a venture of Verizon Communications Inc (VZ.N) and Vodafone Group Plc (VOD.L).

T-Mobile USA is a distant No. 4 in the U.S. mobile market. Analysts said it could take more than three years to properly integrate the iDen, CDMA and GSM networks.

“While the differing network technology standards does not necessarily eliminate the possibility of a deal, it does significantly raise the costs and complexity,” Avian Securities analyst Matthew Thornton said in a research report.

Sprint investors may be wary of a deal at a time when the company's market value is floundering.

Bear Stearns analyst Phil Cusick also said in a note he believed “that operations are still a mess” at Sprint Nextel.

REGULATORY CHALLENGE

Analysts also forecast a drawn-out regulatory review for a Deutsche Telekom deal, made even more unpredictable by the upcoming U.S. presidential elections in November.

Sanford C. Bernstein & Co analyst Craig Moffett estimates that Sprint commands 19 percent of the U.S. wireless market by subscribers, while T-Mobile USA holds 12 percent. Combined, they would exceed AT&T's 27 percent share, he said.

“Such market power concentration would likely draw very significant U.S. antitrust scrutiny,” said Moffett.

But other analysts such a deal could likely pass muster with the government, with policymakers growing worried about AT&T and Verizon's strong position. But they also said that the political reaction to a top wireless carrier becoming foreign-owned was still a wild card.

(Additional reporting by Tiffany Wu, editing by Dave

Zimmerman, Andre Grenon, Richard Chang)

Ruckus Wireless has sued Netgear, alleging the networking vendor infringed its patents on technology for improving Wi-Fi performance and reliability.

Netgear has used Ruckus technology in two products, one of which is still shipping, under a 2005 licensing agreement, according to Ruckus President and CEO Selina Lo. But it used the company's intellectual property in the RangeMax WPN 824v3 wireless router without asking Ruckus's permission or paying royalties, she said. Netgear also is not meeting Ruckus's quality standards for the technology, Lo said.

Ruckus has a system for using antenna arrays to form and direct Wi-Fi signals over the best path at any given time. Ruckus said the technology is unique in the industry and the company has more than 70 patents granted or pending worldwide. Wi-Fi, a highly competitive field, has been a particularly litigious area of high-tech.

Ruckus alleges Netgear is infringing U.S. patents 7,193,562, granted March 2007, and 7,385,912, granted just a few weeks ago, on April 15. It filed suit in the U.S. District Court for the Northern District of California, Lo said. In addition to Netgear, Ruckus is also suing Rayspan, which worked with Netgear on the WPN 824v3 router, charging contributory infringement. The company is seeking a permanent injunction to bar the companies from making or selling the product. It also wants damages and reasonable royalties from the sale of the router and possibly other infringing products, and statutory damages.

“We feel they are damaging something we've built for a long time,” Lo said, adding that it took the founders of Ruckus three and a half years to develop the underlying technology into a product. Ruckus, based in Sunnyvale, California, was founded in 2004.

Netgear, in Santa Clara, California, is a large vendor of networking gear designed primarily for consumers and small and medium-sized businesses. Netgear officials were not immediately available for comment.

SAN FRANCISCO (AFP) - US federal court officials on Monday warned that hackers are emailing phony subpoenas embedded with malicious software to high-ranking executives to steal valuable corporate information.

Thousands of powerful US executives have received the bogus emails that contain links which, if clicked on, install software letting hackers take control of computers and swipe passwords or other sensitive data.

Internet security insiders refer to the attacks as “whaling” because they use social-engineering trickery involved in “phishing” but target individual “big phish” instead of casting nets in a sea of Internet users.

The emails are crafted with the seal of the US federal court in San Diego, California, and are addressed to executives using their names, addresses and other individual details.

Clicking on a link to see a “subpoena” displays a realistic looking document and stealthily installs malicious computer code in the reader's computer.

“When the recipient tries to view the document, they unwittingly download and install software that secretly records keystrokes and sends the data to a remote computer over the Internet,” court officials said in their warning.

“This enables criminals to capture passwords and other personal or financial information and starts software that allows the computer to be controlled remotely.”

Subpoenas in the United States are usually served in person to assure judges that the orders from courts have been properly received by those named.

Google has thrown its weight behind a fledgling security reporting group for the open-source community.

The search engine giant, long a proponent of open-source software, is now one of three sponsors of oCERT, the Open Source Computer Emergency Response Team.

Launched in late March, oCERT aims to be a clearinghouse for data on security vulnerabilities in open-source products, keeping open-source distributors on top of flaws and helping small software projects ensure that users of their code are aware of any issues.

OCERT has published four advisories since its inception. In addition to Google, it is sponsored by Inverse Path and the Open Source Lab.

There are already many national CERT efforts, which coordinate countrywide responses to security threats, but oCERT hopes to meet the unique requirements of the open-source community, where software is often re-used but patches are not always circulated to everyone who needs them.

“It is my hope that this initiative will not only aid in remediating security issues in a timely fashion, but also provide a means for additional security contributions to the open source community,” wrote Google's Will Drewry in a Monday post to the company's security blog.

NEW YORK (Reuters) - Yahoo Inc chief Jerry Yang signaled a more open stance towards Microsoft Corp on Monday, saying he had been seeking common ground when the software maker abruptly ended deal talks.

Yang told Reuters in an interview that he had “mixed feelings” about the weekend outcome, after investors showed their disappointment over the break-up of negotiations by sending Yahoo shares down 15 percent.

“We were negotiating a way to find common ground and then on Saturday they chose to walk away,” said the 39-year-old co-founder of the pioneering Internet company. “They started it and they walked away.”

Asked if Yahoo would still leave a door open for Microsoft to return, Yang said: “If they have anything new to say, we would be open. … I am more than willing to listen.”

After three months of negotiations, Microsoft CEO Steve Ballmer raised his offer for Yahoo to $33 per share from an initial $31, for a total deal value of about $47.5 billion.

Yang held out for $37 per share, saying that even the sweetened offer did not value Yahoo properly for its Web search advertising technology, its prominence in selling display ads and its lucrative overseas holdings.

Some analysts said Yahoo shares, which dropped $4.30 to end at $24.37 on Monday, could have fallen 30 percent to closer to $19.18, its price before Microsoft made its bid public on February 1. But the descent was cushioned by investors who are betting Microsoft will eventually come back to the table.

“This is going to play out over the next several months and there is still a chance Microsoft will buy the company for somewhere around $33 a share,” said Todd Dagres, general partner at venture capital fund Spark Capital. “What Microsoft is hoping is that Yahoo shareholders get militant.”

A GOOGLE VICTORY?

Shares of Microsoft rose initially on investor relief that it was not paying billions more for Yahoo, though the stock ended down slightly amid concerns about how the software maker would develop its Web strategy in the face of a dominant Google Inc.

“I think $33 was fairly generous for Yahoo and if Yahoo won't accept it, they (Microsoft) did the right thing in walking,” said Mike Binger, a fund manager at Thrivent Financial, which owned both Yahoo and Microsoft shares.

Microsoft courted Yahoo to capitalize on the rapidly growing market for Internet advertising, one that has long been served by Yahoo's search, e-mail and Web communities.

It is also trying to fend off the expansion of Google, which has made inroads into Microsoft's home turf with a portfolio of Web based-applications, e-mail and messaging.

But now that a deal has fallen apart, Google has emerged as the key beneficiary. Shares in the company rose 2.3 percent.

“Google has just kept their foot on the accelerator,” said Derek Brown, analyst at Cantor Fitzgerald. “Neither Yahoo nor Microsoft in their current state seems to be a material competitive threat.”

Yahoo is likely to press alternative strategies in coming weeks, including a search advertising partnership with Google and a deal for Time Warner Inc's AOL Internet unit.

A Google deal would boost Yahoo's operating performance in the near term, but runs the risk of regulatory scrutiny over an alliance between the Internet's top two players.

In a letter to Yang over the weekend, Ballmer warned that any deal between Yahoo and Google would be difficult to unravel and would preclude an agreement with Microsoft.

Yang told Reuters the company would take care to structure any new efforts to “preserve as much (as possible) long-term flexibility for Yahoo, both operationally and strategically.”

SHAREHOLDER PRESSURE

Analysts expect a flurry of shareholder lawsuits against Yahoo, and say it may even face direct pressure on its board.

Already, some Yahoo shareholders have started to question how talks were handled.

Bill Miller, a portfolio manager for Legg Mason, Yahoo's second-largest shareholder, told the New York Times in a Sunday interview that he would have considered selling to Microsoft for $34 or $35 a share.

While that was more than Microsoft's offer, it was less than the $37 per share Yahoo's board had insisted on.

Yang, who owns about 4 percent of the company, was expected to hold a meeting with employees on Tuesday in an effort to reassure staff in the wake of the Microsoft talks ending.

Yang said in a post on the company's blog on Sunday night: “No one is celebrating about the outcome of these past three months … and no one should. We live and work in a competitive world and the Web is only going to get more competitive. Executing on our strategic plan is what matters most.”

(Additional reporting by Tiffany Wu in New York and Muralikumar Anantharaman in Boston; Editing by Derek Caney, Braden Reddall, Richard Chang)