Your mail app had been working great on my cellphone for months now. However apparently your company was not satisfied with things working right. So a few days ago you ruined what was working to make it not work. Now I cannot switch between Yahoo mailboxes except by signing out EVERY TIME. I cannot just click on the mailbox name and bring up the other. So that is the reason why I say you ruined what was working. If I seem critical it is only because your app went bad without me causing it.