Do CC or BCC count as one message in outMail?
No. If you send a message to a single email address that is consisted a single message to outMail.
However if you send a single email with one address on the TO: list and three addresses on the CC: list then in fact outMail would consider this as four messages to outMail.
To prevent spammers from sending a single message with one address on the TO: list and several thousand on the BCC: list.