OIT HelpDesk - Knowledge Base
If I recall a message, will my recall be successful?
The success or failure of a recall depends on the several issues, including whether the recipient has read the message and the recipient’s settings in Outlook.
#1 If the original message has not been read, then original message is deleted and the recipient is informed that you, the sender, deleted the message from his or her mailbox.
#2 If the original message is marked as read (viewing in the Reading Pane doesn't constitute reading in this scenario) when the recall message is processed, the recipient is informed that you, the sender, want to delete the message, but the message remains in the recipient's Outlook folder.
#3 On the recipient's computer, Process requests and responses on arrival is selected in the Tracking Options,
For additional information on recalling email message, go to Microsoft’s Online help, http://office.microsoft.com/en-us/assistance/HA010917601033.aspx.