Start Creating your new email.
In the email window click on the options button on the toolbar This brings
up a 'message options' window.
click on the do not deliver before check box.
Set the date and time.
Click on the close button.
Send your email in the normal way.
Make sure whatever time it's set to send the email, Outlook is open, and
ready to run. Otherwise it will not send the email till the next time you
open Outlook and are connected...