Now take the message you received at work and have your mail program show you the raw text of the message. You should not find any trace of the BCC address anywhere.
Actually, I don’t think that CC stands for “carbon copy”. Once upon a time, it was common practice to pluralize a single-letter abbreviation by doubling the letter. That’s where we get “pp.” for pages, “ff” for following, and “cc” for copies. I know this came up on the boards before; I’ll try to dig up the thread.
Found it! Check the first response.
As it turns out, it’s identical to the second response. Blind hamsters I suppose.
No, no, Carabiner was that movie with Liza Minelli, wasn’t it?
(flipping channels to try to find Electric Company…)
Willkommen, Beinvenu, Welcome…
Rats. ultrafilter beat me to it. I discovere the same thing on the same thread. I learn something new every day.
RR
From the “help” files in Outlook 2002:
Oh, sure. Like Microsoft would know. 
Despite what Polycarp had to say on the subject (that cc stands for “copies”), The American Heritage Dictionary defines cc as an abbreviation for carbon copy. Acronym Finder comes up with 179 hits for cc, none of which is “copies.” Sorry, folks.