Time to load
I think OWA is a very cool App which helps me organize and manage my Mail the way I want to. The only thing that bothers me is the duration to open it. Maybe it's just because I'm using the iPhone 4s instead of a newer device, but if want to open OWA I normally just want to check my mail as fast as possible. If the other functions would have to load after that, I guess it would be a little bit more handy to me.