Office 365 (Outlook 2016 | Outlook 2013) - Create tasks and to-do items

Many people keep a list of things to do - on paper, in a spreadsheet, or by using a combination of paper and electronic methods. In Outlook, you can combine your various lists into one list, enhanced with reminders and tracking.

1. Click Tasks > New Tasks or press Ctrl+Shift+K.
   
   
   
   
2. In the Subject box, type a name for the task. If you've got a lot to enter, keep the subject short, and then add the details in the task body. 
   
   
3. If there's a fixed start or end date, set the Start date or Due date.
   
   
4. Set the task's priority by using Priority.
   
   
5. If you want a pop-up reminder, check Reminder, and set the date and time. 
   
   
6. Click Task > Save & Close.