something worth bearing in mind when moving a plone site (or upgrading a plone site, or any other process that requires a full export and reimport of a plone site). If like me you have a habit of installing lots of products just to see what they do, it is worth uninstalling them (removing any objects in the site created using them first) before you do the export. Otherwise you might just find yourself having to track down all the products you used at any point on the site before it will let you import the zexp.