The provisioning task will discover this and report it as per the examples below:
Provisioning for domain 'DOM' started at 6/7/2008 12:00:07 AM
Rank Group name Target name Policy Action
---- ---------- ----------- ------ ------
0 Test group Domino User/DOM Lotus Domino
Mailbox Policy A new Person Document was found in the Domino Directory for user 'CN=Domino User/O=DOM@DOM', who has an existing entry in the Enterprise Vault database. Set the DominoNewPersonDocAction registry value to process this user. See the documentation for further details.
Provisioning Group Summary:
Test group:
Mailboxes added: 0
Mailboxes auto-enabled: 0
Mailboxes updated: 1
Mailboxes updated (by previous target): 0
Targets that returned no mailboxes: 0
Errors: 1
(EvLotusDominoPolicySyncTask) <3480> EV-M {DOMINOMAILBOXPOLICYSYNCTASKPROCESSOR.EN_US} Found a new person document with UNID [96CC353355D35A6980257481004EF9C8] for user [Domino User/Dominion] - mailbox has been locked (set the DominoNewPersonDocAction reg key)By default, new users cannot access the archives of their predecessors, even when they share the same name, but there may be some circumstances in which you want to allow this. For example, it may be appropriate when a former employee rejoins the organization.