nsheikh80 said:
It seem as though you may have got the wrong end of the stick. I'm actually trying to get a BCC field in the Address Book that pops up in Mail and not the BCC header in the actual compose window.
Aah... I see, sorry about that...
I never use the Address button, just start typing the name(s) and let Mail and Address Book together auto complete them for me... I don't think you can add a Bcc button, there, either, so andysmith's suggestion of just dragging and dropping them is probably your best bet.
(Unless you make a couple of groups in your Address Book and just start typing the name(s) of whatever group(s) you want to Bcc the message to, in stead of picking lots of addresses each time.)