Primary (To) and secondary recipients (Cc, Bcc) are logged exactly the same way into Exchange message tracking files up to Exchange 2007, and therefore Promodag Reports counts them as such.
So, no distinction
is made between recipient categories in message tracking files before Exchange 2010. As a consequence, there is no possibility to run a specific report on Cc or Bcc recipients in Promodag Reports if you run Exchange 2007.
If you run Exchange 2010/2016, you can use the Find Specific Messages
report template, that you will find on the Templates > Mailbox Traffic
menu, and filter messages by To, Cc or Bcc recipient count.