...to be called Cortana, and voiced by the HALO actress 
http://www.forbes.com/sites/davidth...-answer-to-siri-to-be-voiced-by-halo-actress/
http://www.polygon.com/2014/1/16/53...s-to-voice-microsofts-siri-like-voice-feature


...we've heard fairly credible rumours that Microsoft is planning on naming its answer to Siri "Cortana"... ...According to Redmond insider MSFTNerd , the company has tapped Jennifer Taylor the actress responsible for Cortana, to voice the assistant...
http://www.forbes.com/sites/davidth...-answer-to-siri-to-be-voiced-by-halo-actress/
http://www.polygon.com/2014/1/16/53...s-to-voice-microsofts-siri-like-voice-feature