With Microsoft Outlook, you can recover email that might have been accidently deleted from your inbox. This is also helpful if your account has been hacked, because hackers often delete all the messages in an account.
To recover deleted email
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In the left pane of the Outlook window, click the Deleted folder. At the bottom of the window, click recover deleted messages.
Outlook will recover as many messages as possible and put them in your Deleted folder. If you don't see the deleted messages that you wanted, it means they are permanently lost.
When the recovered messages are back in your Deleted folder, you should move the important ones back to your inbox or personal folders because the Deleted folder gets cleaned out periodically.