A combined Microsoft and Yahoo would challenge Google in many fronts, IDC says, including online advertising ("together Microsoft and Yahoo command 22.7 percent of the online advertising market share [in the U.S.], in contrast to Google's 32.5 percent") and audience reach (Microsoft and Yahoo together reach nearly 74 percent of the audience, close to Google's 80 percent).
Friday will make it one week since Microsoft made clear its unsolicited intentions to acquire Yahoo for $44.6 billion, a portion of which it would borrow from external sources.InternetNews.com