In Outlook 2010:
1. In Outlook 2010, select the Folder Ribbon.
2. Then select the Recover Deleted Items button.
3. Select the item and select Recover Selected Items.
In Outlook 2007:
1. In Outlook 2007, in the folder from which you deleted the Item, or in the Deleted Items folder, select Recover Deleted Items on the Tools menu.
2. Select the item and select Recover Selected Items.
In OWA:
1. Login to OWA, and right-click on the Deleted Items folder.
2. Then select Recover Deleted Items.
3. Select the item and select Recover Selected Items.
Please remember, you can only recover items that were deleted in the past 30 days.