If you use Outlook as an e-mail client in a Microsoft Exchange Server environment, you can actually recall or replace e-mail messages that you have sent. But you can only recall or replace messages that have not been opened by the recipient or moved to another folder by a recipient.
If the Folder List is not visible, click the View menu, and then click Folder List .
Although you can't recall messages that are sent as Internet e-mail, you can use this feature to notify the recipients of a particular e-mail message that you want them to ignore the message. Use the message recall feature as detailed in the steps in this section. When you "recall" the message, a new message is sent to the original recipient (or recipients) that states you would like to recall the previous message. This doesn't remove the original message from their inbox but it at least provides them with a follow-up message that lets them know that the original message is essentially invalid.