How to use the recall message feature in Outlook

Only works if you're fast and everyone is on an Exchange server.
It allows you to:

1. Delete an e-mail sent by mistake (recall)
2. Change the content of an e-mail with a new one (recall and substitute)

If the recipient is not using exchange then he/she will receive a short message saying "<your name> would like to recall this e-mail" potentially attracting even more attention.

https://support.microsoft.com/en-us/kb/197094

Frank Contrepois - http://frankcontrepois.com for a LIFE, work and sleep harmony blog