When using the Archive Export Wizard to restore archived items to a users mailbox, and shortcuts in the users mailbox have been moved from the original archive location, these shortcuts will not be deleted during the export process. The result of this issue is that the restored item and the shortcut to this item are present in the users mailbox.

If the option to "Remove exported items from archive" had been selected at the start of the export, these shortcuts will now be orphaned, resulting in an error message when used. The following illustrates this process :-

USERS MAILBOX

Inbox\
     ShortcutItem1
     ShortcutItem2
      \Subfolder1
        ShortcutItem3
        ShortcutItem4

All these 4 items are archived by a scheduled run of the archiving task, or by manually archiving them using client-side operations.  

The message titled ShortcutItem1 is then moved to Subfolder1 :-

Inbox \
      ShortcutItem2
       \Subfolder1
         ShortcutItem1
         ShortcutItem3
         ShortcutItem4


Once the archive task has been run with Shortcut Processing mode enabled (and it if the archiving policy is configured to keep track of Moved Items) the position in the archive will get updated so that it reflects the above diagram.

If an administrator then restores all the items below \Inbox using the Export Archive Wizard, and selects the option to remove the archived items afterwards, you will be left with :-

Inbox\
     Item2
     \Subfolder1
       Shortcut1     <- shortcut
       Item1   <- restored item
       Item3
       Item4

All of these will be the original messages, but in addition the shortcut to Item1 will also remain.  Using that shortcut will result in an error message.

After using the registry key, and another run of the archiving task including Shortcut Processing is performed, the shortcut will be removed.

Workaround

This workaround only works if the "Remove exported items from archive" option has been used, thus creating orphaned shortcuts. The following registry key can be used to post-process these items. This key should only be set when this process is required to remove shortcuts, it should also be performed against one mailbox at a time, via a Run Now using the Archiving Task, to limit the impact on the Enterprise Vault and Exchange server.

Warning: Incorrect use of the Windows registry editor may prevent the operating system from functioning properly. Great care should be taken when making changes to a Windows registry. Registry modifications should only be carried-out by persons experienced in the use of the registry editor application. It is recommended that a complete backup of the registry and workstation be made prior to making any registry changes.

Name:-
OrphanedShortcutCheckType

Location :-

HKEY_LOCAL_MACHINE
\SOFTWARE
 \KVS
  \Enterprise Vault
   \Agents

Content :-
DWORD value = 1

A restart of the Exchange Mailbox Archiving Task for the particular Exchange server that the mailbox resides on will be needed each time this process is performed. The registry key value should also be set back to the default of 0 when not in use.