When you perform an eDiscovery search in Exchange Server 2013 to export relevant content within many mailboxes, the search and export operation is unsuccessful. Additionally, you receive the following error message:
Note This issue may not occur when you perform an eDiscovery search within one or two mailboxes.
NotFound Export failed with error type: 'NotFound'.
Note This issue may not occur when you perform an eDiscovery search within one or two mailboxes.