http://newatlas.com/alexa-cortana-chummy/51167/

Amazon and Microsoft have revealed that their voice assistants are set to become acquainted with one another. Cortana will soon be able to talk to Alexa, and vice-versa, opening up new voice-controlled possibilities for users of Echo and Windows 10 devices.

While Alexa and Cortana do share some similarities, there are things one can do that the other can't. Microsoft's virtual assistant can make Skype calls, for example, and hook up directly to Office 365 for work tasks. Alexa, meanwhile, can be used to take users shopping on Amazon and allows control over home appliances (Cortana is making moves in this area, however).