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If you would like to recall an unread email that you sent in Outlook please follow these steps:
Recall or replace an email message that you sent - Microsoft Support
- On the left side of the screen under the Folder pane select Sent Items
- Double-click the message that you want to recall
- Click on the Resend or Recall button
- Halfway across the screen to the right select the Actions down arrow
- Select Recall This Message
- Select Delete Unread Copies of This Message or Delete Unread Copies and Replace with a New Message
- Select OK
- If you are writing a new message, do so and then select Send