A "as well ascurtail the common practice of cc-ing everybody when sending out an e-mail." (lines 11-13) –contrast
B "butwhen an e-mail goes out and five people get cc-ed," (lines 15-16) –reason.
C "In fact, he loves it." (lines 18-19) –condition.
D "Besides, during tough economic times, who will want to miss any information…" (lines 30-32) –addition
E "Work is very seductive, butyetwe're actually less effective." (lines 52-53) –consequence