In Japan, Yahoo! Search will be powered by Google, as announced on the Google Japan and Yahoo! Japan. "Yahoo! Japan says the date the switch becomes effective has yet to be determined. Under the agreement, users of the service will be served both paid and algorithmic search results generated by Google technology on the backend (other contents, i.e. links to Yahoo Japan's Q & A service, will remain in place). Before going for Yahoo Search Technology, Yahoo Japan actually used Google's search engine from April 2001 to May 2004."
The Yahoo Japan-Google deal gives both companies a massive share of the Internet search market in the world's third largest Internet nation (100 million web users).