When you upgrade to Yahoo! Mail, no change is made to your account or the information that is stored in it. Please rest assured that all emails, attachments, and other content will stay in place, and you will be able to access them as you always have – just by signing in to your Yahoo! Mail account.

The differences you will notice are in the interface of your inbox, but the actual contents or your inbox will be completely unchanged. For a preview of what your inbox will look like in the new Yahoo! Mail, please visit this web page.