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Actually the newer interface is only designed for the screen resolution better than 1024 x 600. If you will try to access the new interface in lower resolution, you get a notification that the new Yahoo Mail won't work properly.
Follow these steps to go back to the older Yahoo mail
- SignOut from the Yahoo mail and close the browser.
- Change your desktop resolution to lower than 1024 x 600.
- Now login to your yahoo mail again. You will be notified that the screen resolution is too low.
- Now go to the bottom of the page and you will see the link saying "Return to a previous version of Yahoo Mail." Click on the link.
- Then change your screen resolution to the original