I do not need a solution (just sharing information)
Check out the latest articles from the EV Content Coucil and get information on the various accounts and users that are involved in an Enterprise Vault environment, as well as the permissions required by each.
Enterprise Vault Accounts and Permissions
http://www.symantec.com/docs/TECH76700
Compliance Accelerator and Discovery Accelerator Accounts and Permissions
http://www.symantec.com/docs/TECH200788