My guess is that Microsoft/hotmail logs some information that could potentially be used by law enforcement to track down the sender...
But that's just a guess... Please confirm or tell us the what/when/how/why of these headers.
There are also an X-OriginalArrivalTime and Message-ID headers that could be unique to each message and therefore used as keys to a database that could record everything microsoft knows about the sender, etc, etc.
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