Microsoft and Yahoo! have launched a 10-year web-search deal to challenge market leader Google, but stopped short of combining other advertising businesses or suggesting any deeper ties.
Under the deal, Microsoft's Bing search engine will power search queries on Yahoo! 's sites.
The long-expected deal means Microsoft's new Bing search engine will be combined with Yahoo!'s experience attracting advertisers in the first serious threat to Google - if the companies get regulatory approval and can make the partnership work.