They support any device that supports ActiveSync, which right now includes dozens of windows mobile based sets, iPhones, and the Palm Pre. The only devices that I know of that they do not support are BlackBerries which is due to a very expensive component that they have to purchase from BlackBerry to get full functionality. There are workarounds (BIS) however this represents a huge security risk to yourself and the company and is officially against company policy to use. Besides compared to the alternatives, the BlackBerry devices blow.