I've Gmail, Yahoo mail, Hotmail and TSA mail accounts, though some are not quite active.
I've been using Thunderbird in Windows and now in Ubuntu Linux, it can receive Gmail and TSA mails. I can't get it to work with Yahoo Mail (unless using a paid Yahoo Mail Plus account) in both OSes, neither can it work with Hotmail, unless you use another client Windows Live Mail (in Windows only).
I came across
Yahoo Zimbra Desktop, it says it can work with Yahoo Mail, Gmail, etc., except Hotmail.
Has anyone tried Zimbra? Is Zimbra better than Thunderbird as the former can handle both Gmail and Yahoo Mail?