To manage your flagged email directly in Microsoft To Do, sign in with the same personal, work, or school account that you use for email.
Note: This feature is only available if you’re using an account that’s hosted by Microsoft, such as an Outlook.com, Hotmail.com, or Live.com account. It’s also available if you’re using an account hosted by Microsoft but using a custom domain.
To enable the Flagged Email list, select the option to Show list.
Alternatively, you can also turn the list on in Settings.
Once enable, your flagged email will appear as tasks in Microsoft To Do. The task's name will be the subject of the flagged message and will include a preview of the email's text in its detail view. To open the original email select the option to Open in Outlook from detail view.
Items in the Flagged Email list can be renamed, assigned due dates and reminders, added to My Day, and marked as Important.
Note: Flagged calendar events won’t be converted to tasks in To Do and won’t appear in the Flagged Email list.