Win10 to be no charge update to Win7/Win8

21 January 2015 Last updated at 15:23 ET Windows 10 to get 'holographic' headset and Cortana (http://www.bbc.com/news/technology-30924022) By Leo Kelion Technology desk editor *Microsoft has revealed that Windows 10 will bring its voice-controlled assistant Cortana to PCs.* It also unveiled a headset that it said would one day project the operating system over views of the real world. In addition, the firm announced that the OS upgrade would be offered free of charge for devices running Windows 8, Windows 7 and Windows Phone.