https://www.theregister.co.uk/2017/08/30/alexa_marries_cortana/

Analysis To encourage people to demand more of their software-based assistants, Amazon and Microsoft plan to link their respective voice-based helpers – Alexa and Cortana – so they can talk to one another.

The tie-up, to be consummated later this year, will allow Alexa users to book meetings and read email messages, among other things, via Cortana's Office 365 integration.