The Recover Deleted Items option is disabled on a Windows XP-based client computer.
Cause: There are two possible causes. First, you may be using Outlook over the Internet (which is also called "RPC over HTTP") to check your e-mail. Second, you may havemanually joined the Windows XP-based client computer t o the Windows Small Business Server network. If you did, then you bypassed Windows Small Business Server Client Setup, which enables the Recover Deleted Items option in Outlook.
Solution: You must manually enable the Recover Deleted Items option.
You must log in as an Administrator of the client computer to complete the following procedure.
To manually enable the Recover Deleted Items option
On the client computer, exit Outlook.
Click Start, click Run, and then in the Open text box, type regedit.
Incorrectly editing the registry may severely damage your system. Before making changes to the registry, you should back up any valued data on the computer.
Browse to HKEY_LOCAL_MACHINE\ Software\ Microsoft\ Exchange\ Client\ Options.
From the Edit menu, click New, and then click DWORD Value.
Type the name DumpsterAlwaysOn.
Do not type any spaces in the name.
Double-click DumpsterAlwaysOn, and then in the Value Data field, type 1.