Yahoo Transition - Multiple Cox Email Addresses

Our family has multiple individual email addresses all under our main account, from back when Cox allowed several email addresses per account. 

Will the Yahoo transition move ALL of our email accounts, or just the primary owner account?

This is important for many customers and hasn't been addressed in any FAQ. I'm concerned because the transition notice is only going to the primary email and no notices are going to any other email addresses on our account.

Thanks!