Does anyone know what actual mail and calendaring system this thing even uses? What about maps? All the other stuff aside, texting, mail, calendar, and maps c

Does anyone know what actual mail and calendaring system this thing even uses? What about maps? All the other stuff aside, texting, mail, calendar, and maps cover about 80% of most people's phone use; if those pieces stink, it's going to be a problem, and I see absolutely no mention of where they're getting map data in particular.