Uber recently announced plans to bring integration for its ridesharing service directly to Outlook. They will do this through the new third party app support just announced by Microsoft at the recently wrapped up Build 2015 conference.
The idea for the app is simple: in the same way you might set a time reminder for an event, this add-in will allow you to set Uber ride reminders for calendar events. From their blog:
With the Uber add-in for Outlook, you can set an Uber ride reminder for any calendar event with a single tap. When it’s time to leave for your next event, Uber will send you a notification.
Swipe on the notification to jump to the Uber app with the destination already set, and simply confirm your request. Whether you have an upcoming dinner reservation, doctor’s appointment, or flight, Uber and Outlook will help get you there on time.
Additionally, Uber announced deeper Cortana integration via a new add-in that will be coming this Summer. Previously you could only use your voice to request a Uber car with Cortana.