In the meantime, people close to Yahoo said that the company received a flurry of inquires over the weekend from potential suitors. Some people inside Yahoo have even speculated about the prospect of breaking up the company. That could mean selling or outsourcing its search-related business to Google and spinning off or selling its operations that produce original content, these people said.

“Everyone is considering all kinds of options and a deal on search is one of them,” a person familiar with the situation said.

One person involved in Yahoo’s deliberations suggested that “the sum of the parts are worth more than the whole,” arguing that its various pieces like Yahoo Finance, for example, could be sold to a company like the News Corporation for a huge premium while Yahoo Sports could be sold to a company like ESPN, a unit of the Walt Disney Company.

Executives at rival companies were less optimistic about such a breakup strategy. “No one can get to a $44 billion price,” one executive at a major media company said, “even if you split it into a dozen pieces.”

In making its bid for Yahoo, Microsoft is betting that past antitrust rulings against it for abusing its monopoly power in personal computer software will not restrain its hand in an Internet deal.

In the United States, a federal district court in Washington ruled in 2001 that Microsoft had repeatedly violated the law by stifling the threat to its monopoly position posed by Netscape, which popularized the Web browser. The suit, brought during the Clinton administration, was settled by the Bush administration. But as a result of a consent decree extending through 2009, a federal court and a three-member team of technical experts monitors Microsoft’s behavior.

In 2006, for example, after Google complained to the Justice Department and the European Commission that Microsoft was making its MSN search engine the default in the most recent version of its Web browser, Microsoft modified the software so that consumers could easily change to Google or Yahoo.