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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.

There are two options with recalling a message: you can either delete the message or replace the original message with a new version.

Replacing the original message

1. In Mail, in the Navigation Pane, click Sent Items.
2. Open the message you want to recall or replace.
3. On the Actions menu, click Recall This Message.
4. Click Delete unread copies and replace with a new message.
   • If you are sending the message to a large number of people, you may want to consider clearing the "Tell me if recall succeeds or fails for each recipient" checkbox.
5. Click OK, and then type a new message and include the attachment.
6. Click Send.

Deleting the original message

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• If you are sending the message to a large number of people, you may want to consider clearing the "Tell me if recall succeeds or fails for each recipient" checkbox.
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• How message recall works (Outlook 2003)
• Recall or replace a message after it is sent (Outlook 2007)