Question: I want to change my (yahoo) user id or email address. Please help.? 

Answer: You need not create a new account. \n\nYou can not change an id, but you can surely GET AN ALIAS for the same account, so if you don't like the present id that you have, go for an alias. \n\nGetting alias would not change anything for the acocunt, you will still get mails in the same account.\n\nyou can ask people to send you mails on the new id that you got, but if someone sends it on the old, that is not a problem either. \n\nAnd now yahoo even allows dots in its ids, so you can probably get sometihng like first.last@yahoo.com\n\nhttp://edit.yahoo.com/config/list_alias?.src=ym\n\nhope this helps!
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