On the left hand of the page in folder view, select the Deleted Items folder.
Step
Right click on the item you want to recover from the Deleted Items folder and select Restore. The item will move to the folder it was deleted from (ex. Inbox).
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If the item you'd like to recover has been recently removed from the Deleted Items folder, click Recover items deleted from this folder at the top of the Deleted Items folder.
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Right click the item you'd like to recover and click Restore. The item will move to the folder it was deleted from (ex. Inbox).
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To permanently remove an item from the Deleted Items folder, right click it and click Delete.
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You'll be prompted to confirm that you'd like to delete the item. Click OK to proceed.
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A banner will appear at the bottom of the folder confirming that the item was deleted. Items deleted from the Deleted Items folder can be recovered. Items deleted from the Recover items deleted from this folder section cannot be recovered.