Can I get the old mail interface back?

I'm sure this question and answer is out there somewhere but I just don't feel like searching for an hour, I am tired and I just got home from work. Some accounts have stayed on the old interface, and some have changed to the new. Sadly, my account has automatically changed itself and I want to set it back to the old format, at least long enough for me to review all of my mail and then quit using yahoo.