After creating a ymail.com account, I lost access to my yahoo.com account?

I had an email account: abcdef@yahoo.com
I wanted another account, so generated one for the new 'ymail.com' domain: abcdef@ymail.com.
I don't seem to be able to get my old abcdef@yahoo.com now.
How do I get all my old email under yahoo.com?
Thanks for any help.
4 answers 4