Undeleting Outlook Messages

Sometimes it happens when you hit Delete button you realize that you still need this message or have deleted the wrong one or something like that. But there's no reason for upset - undeleting messages in Outlook is really easy.First, try to undo this action like in all MS Office applications. Go to Edit > Undo or simply hit Ctrl+Z. If you're not using Exchange server you'll instantly get your email back.If this won't work, browse the Deleted items, find the email you've deleted and move it back to your message folder. But the most reliable way is to backup your emails periodically. In this case you will always have a backup copy of all your email messages. Once an email is deleted, restoring from backup file will bring it back. See Outlook Backup tool for details.

Source: http://www.outlookbackup.com/tips/undelete-outlook-message.html