Cortana isn't working for me - it says it's not currently supported in my selected region but I'm in the UK, the PC's region is set to UK, and as far as I can tell, all the language options are set to UK too. And I believe UK is supported. So no idea what's wrong. It might have something to do with me uninstalling the US language pack though as I was fed up of seeing the language switch option in this system tray and the only way i could get rid was to remove any options (leaving only UK English).