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This feature requires you to use a Microsoft Exchange e-mail account. The recipient of the mail you want to recall must also be using an Exchange e-mail account. For example, you cannot recall a message sent to someone's personal (gmail, yahoo) account. If the message was sent to xxxxx@albany.edu, it most likely cannot be recalled. Also, the success or failure of a recall depends on the settings the recipient has in Outlook.
How message recall works (Outlook 2003)
Recall or replace a message after it is sent (Outlook 2007)