For the Archiving Option, the Backup Exec service account must access mailboxes on the Exchange Servers that you want to archive. To gain this access, the Backup Exec service account must have permission to access the Exchange Servers.
You can use either of the following methods to grant the permissions that the Backup Exec service account needs to access the mailboxes on Exchange Servers:
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Grant permissions at the organization level or at the Administrative Group level.
Permissions are then propagated automatically to any new Exchange Servers that you add under the level at which the permissions are assigned.
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Grant permissions explicitly on each Exchange Server.
If you grant permissions explicitly and then add another Exchange Server, you must grant permissions explicitly on the added server as well.
The Backup Exec service account must also have the Send As permission on the mailbox that you create for Backup Exec’s exclusive use. This mailbox, called the system mailbox, must be created on each Exchange Server on which you want to select mailboxes for archiving.
More Information
Granting permissions at the Organization level for Exchange Server 2007 for the Archiving Option
Granting permissions explicitly on each Exchange Server 2007 for the Archiving Option
Granting permissions at the Organization level for Exchange Server 2003 for the Archiving Option
Granting permissions at the server level for Exchange Server 2003 for the Archiving Option