Although it isn't involved directly in the deal, Google is the main reason Yahoo is being pursued by Microsoft.
Yahoo has struggled largely because it hasn't been able to target online ads as effectively as Google.
Microsoft believes Yahoo's brand, engineers, audience and services will provide the company with valuable weapons in its so far unsuccessful attempt to narrow Google's huge lead in the lucrative Internet search and advertising markets.
As it examined ways to thwart Microsoft, Yahoo considered an advertising partnership with Google - an alliance long favored by analysts who believe it would boost the profits of both companies. It was unclear Saturday if Yahoo's plans for boosting its stock price include a Google partnership, which would probably face antitrust issues.
A Microsoft takeover of Yahoo would also be scrutinized by antitrust regulators in the United States and Europe. The antitrust uncertainties could be cited as one of the reasons that Yahoo's board decided to spurn Microsoft.
