Enable 'Recover deleted items for all folders in outlook'

1. Start Registry Editor (Regedt32.exe).
2. Locate and click the following key in the registry:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Client\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.