https://arstechnica.com/gadgets/2017/10/harman-kardon-invoke-review-cortana-isnt-too-comfortable-in-the-home-yet/

The voice assistant most of us overlook is the one that is available to over 500 million of us on Windows PCs. Microsoft's Cortana has been sequestered in laptops and desktops for too long, but now it finally has a home in your home via the Harman Kardon Invoke smart speaker.

This is Microsoft's first attempt to compete with Amazon's Alexa and Google's Assistant, both of which have established smart speakers (not to mention various versions of them). Microsoft is betting on sound quality to set its smart speaker apart from the rest and convince customers to choose Cortana as their home AI buddy. Cortana needs to have a presence free from the PC, but what might hold the Invoke back initially is Cortana's limited usefulness as a home assistant.