Yahoo! Inc. (NASDAQ: YHOO) is an American public corporation headquartered in Sunnyvale, California, (in Silicon Valley), that provides Internet services worldwide. The company is perhaps best known for its web portal, search engine (Yahoo! Search), Yahoo! Directory, Yahoo! Mail, Yahoo! News, advertising, online mapping (Yahoo! Maps), video sharing (Yahoo! Video), and social media websites and services.

Yahoo! was founded by Jerry Yang and David Filo in January 1994 and was incorporated on March 1, 1995.

On January 13, 2009, Yahoo! appointed Carol Bartz, former executive chairperson of Autodesk, as its new chief executive officer and a member of the board of directors.

According to Web traffic analysis companies (including Compete.com, comScore, Alexa Internet, Netcraft, and Nielsen Ratings), the domain yahoo.com attracted at least 1.575 billion visitors annually by 2008. The global network of Yahoo! websites receives 3.4 billion page views per day on average as of October 2007. It is the second most visited website in the world in May 2009.

History and growth

Early history (1994–1999)

In January 1994, Jerry Yang and David Filo were Electrical Engineering graduate students at Stanford University. In April 1994, "Jerry and David's Guide to the World Wide Web" was renamed "Yahoo!", for which the official backronym is "Yet Another Hierarchical Officious Oracle". Filo and Yang said they selected the name because they liked the word's general definition, which comes from Gulliver's Travels by Jonathan Swift: "rude, unsophisticated and uncouth". Its URL was akebono.stanford.edu/yahoo.

The Yahoo! domain was created on January 18, 1995. Yang and Filo realized their website had massive business potential, and on March 1, 1995, Yahoo! was incorporated. On April 5, 1995, Michael Moritz of Sequoia Capital provided Yahoo! with two rounds of venture capital, raising approximately $3 million. On April 12, 1996, Yahoo! had its initial public offering, raising $33.8 million, by selling 2.6 million shares at $13 each.

Like many web search engines and web directories, Yahoo! diversified into a web portal. In the late 1990s, Yahoo!, MSN, Lycos, Excite and other Web portals were growing rapidly. Web portal providers rushed to acquire companies to expand their range of services, in the hope of increasing the time a user stayed at the portal.

On March 8, 1997, Yahoo acquired online communications company Four11. Four11's webmail service, RocketMail, became Yahoo! Mail. Yahoo! also acquired ClassicGames.com and turned it into Yahoo! Games. Yahoo! then acquired direct marketing company Yoyodyne Entertainment, Inc. on October 12. On March 8, 1998, Yahoo! launched Yahoo! Pager, an instant messaging service that was renamed Yahoo! Messenger a year later. On January 28, 1999, Yahoo! acquired web hosting provider GeoCities. Another company Yahoo! acquired was eGroups, which became Yahoo! Groups after the acquisition on June 28, 2000.

When acquiring companies, Yahoo! often changed the relevant terms of service. For example, they claimed intellectual property rights for content on their servers, unlike the companies they acquired. As a result, many of the acquisitions were controversial and unpopular with users of the existing services.

Dot-com bubble (2000–2001)

Yahoo! stock doubled in price in the last month of 1999. On January 3, 2000, at the height of the Dot-com boom, Yahoo! stocks closed at an all-time high of $118.75 a share. Sixteen days later, shares in Yahoo! Japan became the first stocks in Japanese history to trade at over ¥100,000,000, reaching a price of ¥101.4 million ($94,780 at that time).

On February 7, 2000, the Yahoo! domain was brought to a halt for a few hours as it was the victim of a distributed denial of service attack (DDoS). On the next day, its shares rose about $16, or 4.5 percent as the failure was blamed on hackers rather than on an internal glitch, unlike a fault with eBay earlier that year.

During the dot-com boom, the cable news station CNBC also reported that Yahoo! and eBay were discussing a 50/50 merger. Although the merger never materialized the two companies decided to form a marketing/advertising alliance six years later in 2006.

On June 26, 2000, Yahoo! and Google signed an agreement which retained Google as the default worldwide-web search engine for Yahoo! following a beta trial in 1999.

Post dot-com bubble (2002–2009)

Yahoo! was one of the surviving large Internet companies after the dot-com bubble burst. Nevertheless, on September 26, 2001, Yahoo! stocks closed at a five-year low of $4.06 (split-adjusted).

Yahoo! formed partnerships with telecommunications and Internet providers to create content-rich broadband services to compete with AOL. On June 3, 2002, SBC and Yahoo! launched a national co-branded dial-up Internet access service. In July 2003, BT Group Openworld announced an alliance with Yahoo!. On August 23, 2005, Yahoo! and Verizon Communications launched an integrated DSL service.

In late 2002, Yahoo! began to bolster its search services by acquiring other search engines. In December 2002, Yahoo! acquired Inktomi Corporation. In February 2005, Yahoo! acquired Konfabulator and rebranded it Yahoo! Widgets, a desktop application and in July 2003, it acquired Overture Services, Inc. and its subsidiaries AltaVista and AlltheWeb. On February 18, 2004, Yahoo! dropped Google-powered results and returned to using its own technology to provide search results.

In 2004, in response to Google's release of Gmail, Yahoo! upgraded the storage of all free Yahoo! Mail accounts from 4 MB to 1 GB, and all Yahoo! Mail Plus accounts to 2 GB. On July 9, 2004, Yahoo! acquired e-mail provider Oddpost to add an Ajax interface to Yahoo! Mail. On October 13, 2005, Yahoo! and Microsoft announced that Yahoo! Messenger and MSN Messenger would become interoperable. In 2007, Yahoo! took out the storage meters, thus allowing users unlimited storage.

Yahoo! continued acquiring companies to expand its range of services, particularly Web 2.0 services. Yahoo! Launchcast became Yahoo! Music on February 9, 2005. On March 20, 2005, Yahoo! purchased photo sharing service Flickr. On March 29, 2005, the company launched its blogging and social networking service Yahoo! 360°. In June 2005, Yahoo! acquired blo.gs, a service based on RSS feed aggregation. Yahoo! then bought online social event calendar Upcoming.org on October 4, 2005. Yahoo! acquired social bookmark site del.icio.us on December 9, 2005 and then playlist sharing community Webjay on January 9, 2006.

On August 27, 2007, Yahoo! released a new version of Yahoo! Mail. It adds Yahoo! Messenger integration. (which includes Windows Live Messenger due to the networks' federation) and free text messages (not necessarily free to the receiver) to mobile phones in the U.S., Canada, India and the Philippines.

On January 29, 2008, Yahoo! announced that the company was laying off 1,000 employees as the company had suffered severely in its inability to effectively compete with industry search leader Google. The cuts represent 7 percent of the company's workforce of 14,300. Employees are being invited to apply for an unknown number of new positions that are expected to open as the company expands areas that promise faster growth.

In February, 2008, Yahoo! acquired Cambridge, Massachusetts-based Maven Networks, a supplier of internet video players and video advertising tools, for approx. $160 million.

Yahoo! announced on November 17, 2008 that Yang would be stepping down as CEO.

On December 10, 2008, Yahoo! began laying off 1,520 employees around the world as the company managed its way through the global economic downturn. By carefully managing expenses, Yahoo has remained one of the most profitable pure-Internet companies in the world , and maintains billions of dollars on its balance sheet, despite continued "softness" in the advertising world.

Acquisition attempt by Microsoft

Microsoft and Yahoo! pursued merger discussions in 2005, 2006, and 2007, that were all ultimately unsuccessful. At the time, analysts were skeptical about the wisdom of a business combination.

On February 1, 2008, after its friendly takeover offer was rebuffed by Yahoo!, Microsoft made an unsolicited takeover bid to buy Yahoo! for US$44.6 billion in cash and stock. Days later, Yahoo! considered alternatives to the merger with Microsoft, including a merger with internet giant Google or a potential transaction with News Corp. However, on February 11, 2008, Yahoo! decided to reject Microsoft's offer as "substantially undervaluing" Yahoo!'s brand, audience, investments, and growth prospects. As of February 22, two Detroit based pension companies have sued Yahoo! and their board of directors for breaching their duty to shareholders by opposing Microsoft's takeover bid and pursuing "value destructive" third-party deals. In early March, Google CEO Eric Schmidt went on record saying that he was concerned that a potential Microsoft-Yahoo! merger might hurt the Internet by compromising its openness. The value of Microsoft's cash and stock offer declined with Microsoft's stock price, falling to $42.2 billion by April 4. On April 5, Microsoft CEO Steve Ballmer sent a letter to Yahoo!'s board of directors st

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