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InÂ
 Mail, on the ribbon, on the View tab, in the Layout group, select  To-Do Bar. -
Select Calendar.
The To-Do bar immediately appears on the right, showing a calendar grid followed by a list of your upcoming events.Â
Tip:Â For more details, see Use and customize the To-Do bar.
Add the calendar to email view
Applies To
Outlook for Microsoft 365