To do this you must be in the Outlook Desktop App. It is also important to note that this is only relevant if the email was deleted less than 30 days prior to retrieval.
1. Click the 'Folder' tab and then click 'Recovered Deleted Items'.
2. Select the item you want to recover and click 'Recover Selected Items'. This will restore the emails to their original folder e.g. Inbox, Sent Items etc