From your email screen, click 'Help' at the top. Then select 'Feedback' and send them a message about how much you hate new Yahoo and how you are going to switch to Hotmail unless they give you Yahoo Classic back.
They will ignore you, but if we can get enough people doing this every day then eventually they will see their folly and give us the option for Yahoo Classic again. Until then, there is no way to get it back.
