Enterprise Vault for Microsoft Exchange, Version 7.0 or greater, has been installed and configured to archive user mailboxes  As part of the archive creation process, the user account associated as the mailbox owner was also associated as the Billing Account for the archive.  A user's Active Directory account has been deleted.  A new Active Directory account for the user has been created and linked to the user's mailbox.

Now, Enterprise Vault (EV) recognizes the two different security identifiers (SID), therefore, two entries in SQL. That SID must be associated with the same resources as the previous SID in order for the user to regain access to all resources to which it was previously granted.

When the Provisioning Task runs and finds an Exchange mailbox for a user, but the SID does not match, the Provisioning Task generates an Event ID 41107 error in the Enterprise Vault Event Log for each SID mismatch as follows:

Event Type:      Warning
Event Source:    Enterprise Vault
Event Category:  Exchange Provisioning Task
Event ID:        41107
Description:

The Exchange mailbox provisioning task found a new mailbox with an
existing entry in the Enterprise Vault database. The mailbox GUID does
not match the entry in the database.

Task: Exchange Provisioning Task for company.com

Mailbox: /o=company/ou=orgunit/cn=Recipients/cn=user

Set the SynchInMigrationMode registry value in order to process this
mailbox. See the documentation for further details.

For more information, see Help and Support Center at
http://evevent.symantec.com/rosetta/showevent.asp

Solution:

1. If the mailbox is hidden from the Global Address List, unhide it..

2. Create the following registry entry:

HKLM\SOFTWARE\KVS\Enterprise Vault\Agents\SynchInMigrationMode
DWORD - 1

The values are as follows:
0 - (Default.) Generate an error in the event viewer log.
1 - Link the new mailbox to the old record.
2 - Create a new record for the new mailbox

3. Run the Provisioning Task and the mailbox will be linked to the old record.

Note; If  the mailbox will not automatically be linked to the old record,enable the mailbox using by Enable Mailbox wizard.