It's Calendar. We had an interesting experience regarding the $20 minimum last month (July). We had disabled one of our accounts in mid-June, and turned everything back on at mid-day on August 1. So, according to the rules, we should not have been charged the $20 because it was completely turned off all of July.
But on August 2 I got an e-mail from Overture saying we were being charged $20 for the month of July because the account had been partially active. And indeed our account reports displayed exactly one impression (that's 1 impression, not click) on the very last day of July, i.e. the day before everything was reactivated. Trust me, nobody was even working that day (weekend), and certainly nothing was turned on.
They did respond to our complaint and cancelled the charge. But, whoa, it really was disconcerting.
