How do I keep mail online in Yahoo and also download it to another email (Outlook Express)?

You need to change a setting in Outlook Express so that it leaves a copy of the message on the server. Many email client programs like OE are set by default to delete messages from the server after they have been downloaded into the client. I don't use OE, but the path to the setting will be something like Tools %26gt; Accounts %26gt; your account %26gt; Options.