The "Junk Mail Folder" in Outlook is a useful tool for keeping your inbox free from unwanted messages. Occasionally, you may delete all of the email in the folder in an attempt to free up memory on your system without carefully reviewing the messages. You may unintentionally delete important e-mails in the process. Fortunately, Outlook provides a restore feature that allows you to retrieve deleted messages. Since junk e-mails are permanently deleted when removed from the Junk Mail folder, you will need to enable the "Recover Deleted Items" functionality on your mail folders. Here's how to do it:
Open the Registry editor by clicking on "Start," "Run" and then typing "regedit." Click "OK."
Browse to My Computer\HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\Client\Options.
Click "Add Value" on the Edit menu and then add the following registry value: "Value name:" followed by "DumpsterAlwaysOn." Set the DWORD value to "1".
Close Registry Editor and restart Outlook. Click the "Junk Mail Folder" and then select "Tools" on the top menu bar. Click "Recover Deleted Items."
Click the items that you want to recover from your Junk Mail folder and then click "Recover Selected Items." Each recovered item is restored to the folder from which it was deleted. Click the Junk Mail folder again and click "Not Junk" on the toolbar to ensure that the message remains accessible.