The problem is that you don’t have special account on yahoo server “type Plus” and you should pay every year, so you cannot use it with MS outlook or outlook express.
If you want you should subscribe by contacting yahoo administration office.
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I think what the previous respondent is trying to say is that you need a Yahoo Mail Plus account to do this. You can find instructions on how to upgrade your current Yahoo Mail Account to a Mail Plus account, as well as how to configure the rest of the connection, at:
I hope this helps.