Pre-Requisites

1. Must be using the Outlook Desktop Application

Note: Emails can only be flagged and unflagged on the Browser version of Outlook, which can be seen by hovering over the email.

Procedure

Setting up the reminder:

1. Right click on an email message.
2. In the menu that shows up hover over Follow Up and then click on Add Reminder
3. 
4. In the Custom dialog box, in the Flag to box you may type in the reason for the reminder or choose from a dropdown.
5. 
6. Set your Start and Due dates, and check or uncheck Reminder. Click OK to add the reminder, which will go off at the date and time selected.
7. Since Flagging an email will create a Microsoft To-Do item you can check a list of your reminders by click on the click board icon that is by default located in the bottom left.
8. 

Once the reminder is no longer needed:

1. Click the Red Flag displayed on the email. It will change into a Green Checkmark, indicating that is marked complete.

Verification

A Red Flag will appear on the email, and if a reminder was set, a Yellow Bell will also be present.