In February 2011, Nokia announced a partnership with Microsoft to adopt Windows Phone 7 as Nokia's primary operating system, leaving further Symbian development in question. Nokia has promised support for Symbian and its newer devices until at least 2016, but no new Symbian devices will be released after Nokia 808 PureView. On 29 April 2011, Nokia announce that it would transfer Symbian activities to Accenture along with 3,000 employees.