Note: This function is VERY time sensitive and must be done as soon as the error is identified.
Click on Sent Items.
Find the message you want recalled and double-click to open it.
Go to the Ribbon.
In the Actions section, click Other Actions
Select Recall This Message.
Select Delete unread copies of this message.
To be notified about the success of the recall, check the Tell me if recall succeeds or fails for each recipient checkbox.
If the operation was successful you will receive an email minutes later for verification:
To: John Dough
Subject: recalled message
Sent: 4/27/2010 11:00 AM
was recalled successfully on 4/27/2010 11:00 AM."