Microsoft Office Outlook 2007 provides a way to recover items after you delete them permanently by pressing SHIFT+DELETE, and even after you empty the Deleted Items folder.
Step 1) From the Tools menu > click Recover Deleted Items
Steo 2) Click an item and then click Recover Selected Items
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(You can select multiple items by pressing CTRL as you click each item.)
Step 3) Then the recovered item is restored to the folder from which it was deleted.
Note: This feature requires you to use a Microsoft Exchange Server 2000, Exchange Server 2003, or Exchange Server 2007 account. Most home and personal accounts do not use Microsoft Exchange. This feature is not available for web or Mac users.