Maybe this can help you, I use Internet Explorer and could not find a solution to switch back to Classic Mail permanently after 2 days of pulling my hair out lots of problems! I have not found links work permanently, I went to CONTACT YAHOO CUSTOMER CARE, then clicked on LIVE CHAT, told them my old computer can not handle it, and they switched me back 5 to10 min. total, no problem, and they do not prompt me to switch anymore! You can also call Yahoo USA, but you will wait forever! 1-866-562-7219. Don’t forget to vote for best answer. Anyway Good Luck!