Microsoft's developer conference, Build 2018 revealed that in a few weeks, something creepy is going to happen. That's right, Microsoft is working on a new version of Cortana which will enable it to talk to other AIs. Cortana is currently being developed to work with Amazon's digital assistant, Alexa. So you will have to get accustomed to saying to this “Alexa, open Cortana”
This way, users can take advantage of both virtual assistants' skills and functions. Cortana can be commanded on an Alexa-powered device to send an email or read one's schedule.