Microsoft, Yahoo! Await Antitrust Scrutiny



Howard Shelanski, a professor at the University of California Berkeley School of Law, says that regardless of whether the Microsoft-Yahoo deal is ultimately approved, the deal's size and complexity means it will likely prompt regulators to extend the initial 30-day review period for an additional six months, in what is known as a second request for information.

"These firms are both major players, and there's certainly some horizontal overlap," says Shelansky.

Besides each Web site's search service, the companies also provide competing services like email and instant messaging.

"There are many other markets involved here," says Shelanski, and each market needs to be evaluated on its own merits.