You work at Amex right? You need to have full outlook - not the web version.
Open the message you wish to recall from Sent Items folder, click recall this message then 'delete from recripicants (sp) inbox'. once this is done you will get a success or fail message in your inbox.
Working at Threshers off licence and made a mistake on my first order. As we sold beer by the can I assumed that it was ordered in the same way.
Therefore I set to order 240 cans (10 cases) of this and that and the other, I soon found out that when ordering beer it was ordered by the case...