Can't see old Yahoo emails

Since downloading em client, I cannot seem to find my older Yahoo emails on the Yahoo Mail site (or on my iPhone). I can see them on my laptop in em client, but they are not there in the actual Yahoo Mail website. I think it might be to do with the archiving on em client, but not sure. How can I fix this so I can see all my old emails on Yahoo again?

Thanks

Hello George, are the contacts visible in the Yahoo contacts folder? What version of eM Client are you currently using on your computer, can you please check the exact release number in Help > About? Are you seeing any errors thrown  by the application when you synchronise your accounts with the server?

Regards,