You can recall or replace only those messages you sent to recipients who
are logged on and using Outlook and who have not read the message or moved the
message out of their Inboxes.
If the Folder List is not
visible, click the View menu, and then click Folder List.
Click Sent Items.
Open the message you want to
recall or replace.
On the Actions menu,
click Recall This Message.
To recall the message, click Delete
unread copies of this message.
To replace the message with
another, click Delete unread copies and replace with a new message, click
OK, and then type a new message.
To be notified about the success
of the recall or replacement for each recipient, select the Tell me if recall
succeeds or fails for each recipient check box.
Note To replace a message, you must send a new one. If you do not
send the new item, the original message is still recalled.