I just got my company to pay $30 for Winzip 10.0 for my work pc, only trouble is anyone I send a zip file to who hasn't also got winzip 10.0 can't unzip the archive and that includes me at home :o(. I'm sure there is a way of configuring 10.0 to produce archives that are  backwardly compatible but I would expect it to work 'out of the box' or to at least to have highlighted the option during the installation. In this day and age with products of this maturity we shouldn't have to deal with this crap.