How to Recover a Deleted Mail Folder
Microsoft Outlook provides a method of recovering deleted mail folders even after you empty the "Deleted Items" folder. By default, Outlook doesn't show you the "Recover Deleted Items" option in the "Tools" menu, however, you can modify the registry to make this command available, regardless of the Outlook folder you use.
Instructions
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Exit Outlook if it is open at the moment.
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Go to "Start" > "Run."
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Type "regedit," and click "OK."
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Navigate to "My Computer\HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\Client\Options."
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Go to "Edit" from the top menu.
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Click "New."
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Click "DWORD Value."
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Type "DumpsterAlwaysOn" (make sure you don't type any spaces between).
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Specify "1" as the "DWORD" value.
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Open Outlook.
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Go to "Tools" from the top menu, and click "Recover Deleted Items." Every folder that you ever deleted will then be shown in its respective place. You can click it to highlight, and select "Recover."
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Tips & Warnings
Microsoft doesn't take responsibility if you use the registry editor incorrectly and cause permanent problems to your system, which can only be resolved by reinstalling the operating system. You have to use the registry editor carefully.