Migrated from WebTV account to outlook but can’t remember Outlook email address

A friend of mine created her new Outlook account because WebTV is ending. She created the account in early August 2013 and never used it. Now, today (Sept 30 2013) WebTV is ending and she can't find her Outlook.com email address anywhere. She found the password, but did not write down the email address *sigh*.

Help please.