How to link an old Enterprise Vault (EV) archive to a new mailbox

In certain cases it may be necessary to re-link an old archive to a new user's mailbox.  
To reconnect the new user account and mailbox to the old archive perform the following:

1. Clear (Zap) the inherited permissions on the archive, that will be pointing to the old user account. See  Related Articles section for details.

2. Remove the old entry from SQL:

Run the following SQL query:

Use EnterpriseVaultDirectory
Select * From ExchangeMailboxEntry
Where mbxalias = ' useralias'

Note: Replace useralias with the alias of the old user account linked to the archive.  Confirm there is only one result and it is the correct entry.

Run the following query to delete the entry:

Use EnterpriseVaultDirectory
Delete From ExchangeMailboxEntry
Where mbxalias = ' useralias'

3. Ensure the new user account is added to a Provisioning group

4. Run the Provisioning Task to update the ExchangeMailboxEntry table with the new user account.
   a. Open Vault Admin Console (VAC)
   b. Expand Enterprise Vault Servers
   c. Select Tasks
   d. Right-click the Exchange Provisioning Task for <Sitename> and select Run Now 

   e. Select In normal mode and then click OK.

Note:The Provisioning Task status will change to Processing.

5. Let the Provisioning Task process, until the Status changes back to Running.

Note: Refresh the VAC periodically to confirm when complete.

6. Enable the mailbox.
   a. Select Tools > Enable Mailboxes ... in the VAC.  
   b. Specify the Exchange Server where the new users mailbox resides and click  Next.
   c. Proceed through the Wizard and Select the mailbox to enable.
   d. On the Select the mailboxes that are to be enabled page, highlight the user and select Select Archive.
   e. Specify the old Mailbox Archive to associate the Mailbox to.
   f. Finish the Wizard and confirm that the mailbox has been enabled successfully.

7. Run a Synchronization from the Task Properties, Synchronization tab.

8. Close and reopen Outlook on the client

The mailbox will now be associated with the old archive.