How does Cortana daily “Briefing” work?
You will receive a daily “Briefing” email. This email assembles existing information (i.e. tasks, documents, emails, and meetings) to which you already have access and summarizes them in an organized manner. You will receive a personalized brief email in Outlook at the beginning of each workday. The email comes from email@example.com.
What if I do not want to receive the "Briefing"?
There is a unsubscribe link included within the daily briefing message itself at the bottom. Alternately, you can choose to opt-in (or back out) at any time by visiting cortana.office.com (while logged into Office 365). Note: Any changes you make to the settings will require 24 hours to take effect.