Playing Devil's Advocate here:
When Robert Altman cast Shelley Duvall as Olive Oyl in "Popeye," one critic whose review I read called it "the role she was born to play."
So, I'm sitting there waiting for the boss to reply, not knowing that the boss is gone.
Then why did you relegate the boss to Cc:? People from whom a response is important belong on the To: line. The boss, either not on vacation or back from vacation, could very logically look at your message, see that [s]he was merely carboned, and figure that you just wanted him/her to read the message and that that would be enough; that you would probably not find a reply from him/her unwelcome, but you weren't expecting one.
IMHO ...
IMConsideredO, Cc: is for advisory copies to peripheral parties.
