Open Outlook and go to the Sent Items folder
Double-click the message you want to recall to open it
Select File
Select Info
Select Message Resend and Recall
Select Recall This Message
Choose one of the following:
Delete unread copies of this message
Delete unread copies and replace with a new message
Select the option to tell you whether the recall succeeds or fails for each recipient if desired
Select OK
If replacing the message, edit the new message and send it again