Cortana was designed in many ways to mimic a personal assistant in Windows. Just say “Hey Cortana” and she’ll respond with an answer to a question, or carry out any number of functions for you. Well today she’s going to start scanning your emails in order to create helpful reminders in your calendar.

Any good assistant that has access to your business email would probably also want to put your scheduled appointments in your calendar. I say “probably” because I’ve obviously never had an assistant, and am just going off of what people do in the movies. Of course, Cortana will need your permission to actually add the appointment, as she can’t tell the difference between important meetings, and casual conversations that don’t need appointments.
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https://www.slashgear.com/windows-cortana-will-snoop-through-your-email-to-set-appointments-25424227/