After Microsoft and Yahoo failed to come to agreeable terms, the latter quickly announced it had reached a deal to run the Googles ads alongside its own search results and on some of its websites in the United States and Canada. Microsoft is unhappy with this and is petitioning the Government to hear their pleas. Redmond is concerned that any deal between the two rival search giants would comprise a monopoly of search advertising, if not search itself. Google and Yahoo on the other hand defended their deal, claiming it would make Yahoo a stronger company.
Microsoft expressed similar concerns earlier in the year when they claimed Google was in no position to buy Yahoo, as it would instantly make them a monopoly. A bit curious coming from a company that enjoyed a near total monopoly on desktop operating systems and Internet browsers for many years, even if they are correct in their assertion.