vanman, as the Ozman has mentioned, if you have seperate e-mail addies, go to Outlook's menu, and then in the 'tools' section there should be a 'inbox-assistent'. This will help you making a filter for your incoming mail.
I myself use EudoraPro, and I think the interface on 4.2 is quite acceptable
(you can even get it for far less than 20 quid, if you know where to look
)