Existe um guia no site de suporte do Office: Como a rechamada de mensagens funciona
De lá:
Do the following:
In Mail, in the Navigation Pane, click Sent Items.
Open the message you want to recall or replace.
On the Actions menu, click
Recall This Message
.Click Delete unread copies and replace with a new message.
Click OK, and then type a new message and include the attachment.
Click Send.
NOTE If you are sending the message to a large number of people, you may want to consider clearing the Tell me if recall succeeds or fails for each recipient check box.