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It is possible to recover deleted email messages after emptying the Deleted Items if the recovery attempt occurs before the final cleanup process runs. The recovery period is 3 days for all users. If you are within this period, try these steps:
 
  1. Open Outlook.
  2. Select the Deleted Items folder.
  3. Click the Folder tab at the top of the page.
  4. Click Recover Deleted Items in the Clean Up section.
  5. Select the message(s) you wish to recover (use Ctrl + Click to select multiple messages) then click the second icon on the toolbar.
  6. The window will close and the selected emails should appear in the Deleted Items folder within a few minutes.