Assume that you create an In-Place eDiscovery search in Microsoft Exchange Server 2013 Exchange Admin Center (EAC). You select the Copy Search Results
option for the search, and then you select the Include Unsearchable Items
check box to copy the search results. In this situation, the search fails, and you receive the following error message:
Errors: Failed exporting item id: from source id: SMTP_Address with error: [FailedToGetUnsearchableItems] Export failed with error type: 'FailedToGetUnsearchableItems'. Details: There is an error in the XML document (Number).