Thanks for your post.
Setting up message rules in Outlook Express is one of those things which looks incredibly complicated when you first do it but after a bit of trial and error (and possibly following my 'worked example') you'll probably realise that it's actually quite easy really.
When the good weather is ended by the inevitable thunderstorm, why not give it a go? Even if you get it wrong, it won't do any great harm (and it's easy to delete message rules that you no longer require).
Chris