1.

Configure Exchange Server to retain deleted items. For additional information about how to configure Exchange Server to retain deleted items, click the following article number to view the article in the Microsoft Knowledge Base:

246283 (http://support.microsoft.com/kb/246283/) Set deleted mail message retention time in Exchange Server 5.5

2.

Click Start, click Run, type regedit, and then click OK.

3.

Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Client\Options

4.

Right-click the Options subkey, point to New, and then click DWORD Value.

5.

Type DumpsterAlwaysOn for the DWORD name, and then press ENTER.

6.

Double-click DumpsterAlwaysOn.

7.

In the Value data box, type 1, and then click OK.

8.

Quit Registry Editor.