General errors which EVPM can generate and how to handle them (4268640)

Issue
EVPM is used by the Enterprise Vault Provisioning Module for several of its commands. There are a number of things that can prevent the successful running of EVPM, these are described below.
Solution
The errors which are likely to be seen are ‘Cannot create priviledged MAPI session’. The general steps to review for this type of error are:
* Make sure that the SMTP address of the System Mailbox in Enterprise Vault is the PRIMARY SMTP address of the system mailbox user from Active Directory. If it isn’t then browse again for the system mailbox on the Enterprise Vault archiving task and select it again.
* Reboot the Enterprise Vault server
* Set the DS Server registry key for Exchange 2010 (and higher) or ClosestGC for Exchange 2007 and lower.  See: https://www.veritas.com/content/support/en_US/article.100003011.html