I haven't actually used duplex printing on the MX860 yet, and don't have the time right now to give it a whirl for you. The scanning, yes, is wireless, and it'll scan to print or to pdf or to jpeg on your computer. If you're on Snow Leopard, you have to make sure you have the updated drivers from Canon, though, and the first installation/set-up has to be done through physical connection (USB, if I remember correctly). I was pretty sure that the 860 can fax from a Mac, but, again, I haven't taken the time to double check or set it up for that. Some searching should bring up the answer to that.