Is there a way to access obsolete e-mail accounts?

That depends on what you think an obsolete E-mail account is. If it is an E-mail account that you have not used in a very long time, and has probably been closed due to inactivity, then no. If it has been closed, then once an account has been suspended, closed, or deleted it is gone forever, and can not be restored or reactivated. All information on the account is lost and you can not use the ID name ociated with that account, either. You will have to open a new account with a different ID name. Sorry ...