Read emails disappear after you refresh app. Important information that i will need to access later by open up the email again have disappear unless you have flagged them. Can't change how long until old email gets deleted. I have missed meetings and are missing recites beacuse email disappear. This is very frustrating and I am using another app for work mail beacuse of this. If you could change this in settings i would rate it 5 out 5. Other then that specific thing it is really good.