Office 365 is about helping you be more productive so you can make the most of every moment. We believe the future of productivity involves technology that is truly personal and can work on your behalf. This belief is a driving force behind Microsoft’s personal digital assistant Cortana, which is coming to PCs and tablets, with Windows 10. Cortana learns your preferences to provide relevant recommendations, fast access to information, and important notifications. Cortana in Windows 10 can help you at home, at work and on the go.
Read more at source: https://blogs.office.com/2015/06/29/an-early-look-at-cortana-integration-with-office-365/