How to Recover Deleted Items Using Microsoft Outlook
Note: these procedures only apply if you have installed Outlook and you are connected to an Exchange Server.

When items are deleted from a folder in a mailbox, those items are first transferred to the deleted items folder of that mailbox. The items can then be deleted from the deleted items folder. This provides a measure of protection in case of accidental deletion. After the items are deleted from the deleted items folder, the items can still be recovered for up to 30 days by using the Recover Deleted Items function.