By default, the Recover Deleted Items functionality is only enabled on the Deleted Items folder in a user's private folders; items that are hard deleted cannot be recovered. 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:
1. Start Registry Editor (Regedt32.exe).
2. Locate and click the following key in the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Cli ent\Options
3. On the Edit menu, click Add Value, and then add the following registry value:
Value name: DumpsterAlwaysOn
Data type: DWORD
Value data: 1
4. Quit Registry Editor.
You can use an administrator's computer or a user's computer to make this change to the registry. After you change the registry, start Outlook, and then click Deleted Item Recovery on the Tools menu. A list of items that have been hard deleted during the retention time set on the server is displayed.
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