HTC Desire :: Internet Email Accounts / Synching Read / Unread And Deletions

I have synced my desire with yahoo mail.The phone doesnt duplicate deletions from yahoo to phone or phone to yahoo so have to delete everything twice (Windows mobile does it.)Also when the phone goes and gets the mail from yahoo it marks them as read on the internet and unread on the phone. WM synched the read status - did not mark the yahoo mail as read when downloaded and the read status was synced from the phone to yahoo or yahoo to the phone depending on which was read first.Presume i need to download someone's app.