Cortana is Microsoft's secret mobile weapon

Cortana is slowly emerging as Microsoft's secret mobile weapon. While the software giant hasn't fared well with its Windows Phone operating system, Cortana is key to Microsoft's mobile future. Microsoft appears to be taking a similar approach to Google with its Toolbar app. At the Build developer conference last week, the message was clear: Microsoft wants Cortana to be everywhere. Cortana will help power Microsoft's new bot platform, showing up in Skype to help you talk to bots, schedule meetings, and generally digitally manage your life.