As everyone knows Microsoft had given up Yahoo (for now, I think).
In Brazil that means nothing, because here Yahoo and Microsoft are still operating together, as during the early days of Overture.
Therefore, the “Search duopoly” mentioned by Danny Sullivan in his AdAge article a couple of days before the deal went off, is already a reality in Brazil, where Google is still a dominant player and Yahoo (even combined with Microsoft) cannot face his leadership. And besides those two, there are very few relevant options for your search campaign.