To Recall a Message:

1. Open Outlook.

2. Navigate to the Sent Items folder in the left sidebar.

3. Double click the message you want to recall.

4. A new window will appear showing only the message you clicked, as well as a bar at the top with several options and menus.

5. Click the Message menu at the top left area of the window.

6. Navigate to the Move section of the dropdown ribbon and select the More Move Actions icon at the right.

7. Select Recall This Message... from the dropdown menu.

8. Select whether or not you want to only Delete unread copies or to Delete unread copies and replace with a new one. You can optionally select whether or not you want to be notified if the recall succeeds or fails. When finished, click OK at the bottom of the window.