Amazon has ended its relationship with Google and is now using MSN to provide search results on its site.

A9 runs as a standalone site offering book, news, web and wikipedia searches, and provides the technology behind searches on Amazon.com - which were previously "powered by Google".

Results will now be provided by Windows Live Search. The change is a big win for Microsoft which usually trails behind Google and Yahoo! in web searches.

MS is widely expected to go head-to-head with Google with the release of Vista and IE7.

It also emerged today that Google has complained informally to competition authorities in Europe and the US.

Financial terms were not released. More details on Reuters here. ®