Upon a closer review I've realised the mailmerge process my code uses, which relies on Word's VBA object model, doesn't support CC and BCC output. Accordingly, a substantial re-write of the code would be required, with Outlook Automation, in order for that to be done. I really don't know enough of how Outlook works to do that. You may get better results using one of the Many-to-One Mail Merge add-ins, from:
Graham Mayor at
http://www.gmayor.com/ManyToOne.htm; or
Doug Robbins at
http://bit.ly/1hduSCB