I saw this reg key. it may help :
EnableOutlookRecoverDeletedArchivedItems
HKEY_LOCAL_MACHINE\SOFTWARE\KVS\Enterprise Vault\Agents
0 — (Default) Archived items are not available when using Disable Recover
Deleted Items.
1 — Archived items are available when using Disable Recover Deleted Items.
Description
Enables you to make archived items available using the Outlook Recover
Deleted Items option on the Outlook menu. Any item that is archived and
changed into a shortcut, or archived and automatically deleted, will be available
when using the Outlook Recover Deleted Items feature.
You must restart Exchange Server Archiving Tasks in order to make changes to
EnableOutlookRecoverDeletedArchivedItems take effect.