As with the ingestion in to Office 365, ingestion in to Exchange may be subject to throttling limits within Microsoft Exchange. A knowledge base article has been created which can help raise these limits.
By default the Exchange Import Module will attempt to ingest items into the chosen target mailbox or personal archive three times using AIP and then will fall back to trying Exchange Web Services (EWS). If they all fail, then the ItemRoutingErrorCount will be incremented, and the item will be counted as failed (and it will be visible on the Failed Items screen, and retried from time to time).

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