I have always enjoyed classic mail and have tried the "new" format and I didn't like it. I can't filter e-mails in the new format and I'm easily able to do so using the classic version. I will strongly consider switching my primary e-mail to another site once Classic mail is discontinued after January 31, 2019. I know many others feel the same way about Yahoo gradually ridding itself of Classic mail from all of the comments on here. I really hope Yahoo will listen to its users and keep Classic mail as an alternative to their new version.