I recently got a smart phone. I got an HTC Inspire Android. Up until just 3 weeks ago, yes I know, pathetic for a web programmer, I had a crappy Samsung flip phone which was only ok at the about 6 years ago. So naturally I got the email Yahoo app.
My biggest complaint, and really the only one, is that the email browser window cannot resize using two fingers like most other app windows do like in the FireFox app. You also cannot move the window diagonally. You have to wait until the screen is locked until you can move it in a perpendicular position.
Yahoo please fix.