Is there any way to change back the All-New or FULL VERSION of the yahoo email back to Yahoo Classic?

I've tried searching everywhere and even tried to find the options myself by tinkering all links that I can find with the Newest Version (Not the BETA one which contains the Option below your username to switch back nor a link on the Upper Right Side) but really, there is not other way. The reason why I'm switching it back is because my YM on my Blackberry will only work when your email is on the Yahoo Classic mode. so Yahoo, please fix this already!