You can grant the Full Control permission for the Backup Exec service account on each Exchange Server. Perform this procedure on each Exchange Server that you want to archive.
See About granting permissions on the Exchange Server for the Backup Exec service account in the Archiving Option .
To grant permissions explicitly on each Exchange Server 2007 for the Archiving Option
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On the Exchange Server, click Start > All Programs > Microsoft Exchange Server 2007 > Exchange Management Shell.
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Get-MailboxServer -Identity “<mailbox server name>” > | Add-ADPermission -User “<Domain name\Backup Exe service account>” -AccessRights GenericAll -InheritanceType All
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Add-ADPermission -Identity ‘<system mailbox name>’ -User ‘<Domain Name\Backup Exec service account>’ -ExtendedRights ‘Send-as’