In the outlook express you have to go to tools and then accounts. Then select the mail option and then select yahoo mail and then click properties. After this you have to click on the advanced tab and in the option ‘leave a copy of messages on server’, do not choose this option. This will not save your message in yahoo mail inbox after it has been exported to outlook express. Now click OK and closed outlook express and start again. If you have any doubts regarding this process you must readily contact yahoo customer support and learn in detail. The technical team of yahoo is always available and is ready to provide you with meaningful solutions.