Ah, the familiar comfort of the old Yahoo Mail. While Yahoo officially retired the classic interface, some users still yearn for its simplicity. So, can you actually switch back? Unfortunately, a direct, officially supported method no longer exists. Yahoo pushes users towards the updated version for security and feature improvements.
However, depending on when you last used the old version, and your browser settings, there's a tiny chance a cached version might load. Try clearing your browser's cache and cookies. Then, attempt to access Yahoo Mail again. Sometimes, this can trigger the older interface, especially if a cookie pointing to the old version persists.
Keep in mind this is a long shot, and future Yahoo updates might permanently prevent accessing the classic look. Embrace the new features, even if initially frustrating! Many find the modern interface more secure and eventually easier to navigate. Good luck!