Microsoft Voice Assistant Cortana in today's update, allowing users to connect to Google accounts. This feature is currently only Windows 10 platform, I believe soon will be on the iOS and Android platform. Users open Cortana's account page, select the new service under Connected Services, select the Gmail account can choose to manage other Google services such as calendars.
Unfortunately, the current user can only add a Google account, if you have two accounts to distinguish between work and life, then you need to make a choice. Some orders can be issued through Cortana, but not very complete. Cortana users can consult the next task in the Google Calendar what is the future, I believe Microsoft will gradually improve.