AdCenter customers requested more clicks for their ads. Microsoft ran tests that found adding a fourth mainline ad (the ads that appear above the organic results) increased clicks. So, the Live Search team is implementing those changes, and advertisers should notice the change beginning today.
The top 2 mainline ads will continue to get an extra placement at the bottom of the page as well. This is something that also proved successful in the ad placement testing.
What do you think of these changes? Will they increase your clicks? Let us know your thoughts in the comments.