A member survey of IT professionals done by Spiceworks has found Cortana to be the most widely implemented virtual assistant in North American and European businesses. Siri follows closely behind with Google Assistant and Alexa having significantly lower market shares. These results are an interesting contrast to consumer usage.
https://www.notebookcheck.net/Cortana-ranked-as-the-most-popular-virtual-assistant-for-businesses.300684.0.html