While MSN adCenter has been in pilot mode since mid-October, Microsoft CEO Steve Ballmer is announcing the official launch of adCenter at Thursday's MSN Strategic Account Summit... as well as the new name change to Microsoft adCenter.

Along with the launch comes news that adCenter will launch in the UK market on a limited basis in June, begin testing their contextual advertising this summer, provide ads on multiple Live products and drop Yahoo! Search Marketing ads from all US-based searches on MSN Search.

Read more about the launch of Microsoft's adCenter at http://blog.searchenginewatch.com/blog/060504-020318.