I already have an email account through Yahoo! Do I need to use the AT&T Yahoo! email address?

If you are already have a "you@yahoo.com" email account you can continue to access your mail separately if you wish. However, we highly recommend you give your existing you@yahoo.com account all the benefit of your new AT&T Yahoo! High Speed Internet service. This can be done at no additional charge by merging your you@yahoo.com account with your new AT&T Yahoo! account during the registration process. Just imagine all the added value you get from getting additional storage, premium spam functionality, premium virus protection, and more. AT&T Yahoo! Mail users will also be able to receive messages from multiple email accounts (including @sbcglobal.net and @yahoo.com accounts) in a single inbox.