Too many e-mails
I absolutely hate it when people send out a million e-mails back and forth on a particular subject with 10 people CCed. I got into work this morning and saw 10 e-mails all on the same chain that had been sent out last night (after 6:30pm). This is so inefficient and completely unnecessary. I had to spend 30 minutes going through each e-mail and try to understand what the fuck everyone was trying to say, and it still didnt make sense.
If there is that much confusion that 150 e-mails have to go around to figure out an issue, someone needs to just call for a conference call.