Select Sent Items in the left folder pane, then double-click the message to open it in a separate window.
In the message window, go to File > Info.
Select Resend or Recall > Recall This Message, and choose one of the two options:
Select Delete unread copies of this message to recall and delete the sent message.
Select Delete unread copies and replace with a new message to replace the sent message with a new message.
4. Select the Tell me if recall succeeds or fails for each recipient check box, then OK.
Note: If a recipient has already read a message, it can't be recalled from that person. For more details on email recall, see Recall or replace an email message that you sent.