In order for Archive Shuttle 6.6 and later to ingest data into an Exchange 2007 mailbox, the accounts used need to be granted extra permissions. This article explains how to do that.
The following commands can be executed in Exchange Management Shell:

Get-ExchangeServer | Add-ADPermission –User “DOMAIN\userName” -extendedRights ms-Exch-EPI-Impersonation -InheritanceType none
Get-MailboxDatabase | Add-ADPermission -User “DOMAIN\userName” -extendedRights ms-Exch-EPI-May-Impersonate -InheritanceType none

Note: The calling account cannot be a member of any administrator group. This permission is explicitly denied to those groups.

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