Messagestats does count all recipients, regardless of their type in the message (i.e. To, CC or BCC). This information is used primarily in the aggregation for the Mailbox Activity information.
However, what is not done is the separation of each of the recipients into each of the recipient types (i.e. To, CC or BCC). This is due directly to fact that the information that is logged into the Exchange Tracking Log by Microsoft Exchange does not contain that breakdown.
The Exchange Tracking Log contains a recipient field that contains all of the recipients on a message, regardless of their type.
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