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Locate and click the following key in the registry: HKEY_LOCAL_MACHINE\ SOFTWARE\ Microsoft\ Exchange\ Client\ Options To enable the Recover Deleted Items functionality on mail folders other than Deleted Items (for example, for Sent Items, Drafts, Outbox and Inbox folders), you must make the following changes to the registry: On e-mail clients prior to Outlook 2007, the Recover Deleted Items functionality is only enabled on the Deleted Items folder in a user's mailbox.
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In Outlook 2016 select the Folders ribbon and click Recover Deleted Items. Messages deleted using either of the methods previously described can be recovered by using the Recover Deleted Items feature in Microsoft Outlook.
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This procedure is called a "hard delete" as opposed to a "soft delete". It is also possible to permanently delete items without first moving them to the Deleted Items folder by pressing SHIFT+DELETE. You can then delete these items from the Deleted Items folder. When you delete items from a folder in a mailbox, the items first are shifted to the Deleted Items folder in the mailbox. How to recover items that have been hard deleted in Outlook
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