It is pretty annoying tha the “tag” system in Thunderbird bears no relation to any tagging system implemented within the past four years. It is, at best, a non-folder-based categorization system, and doesn’t even have a particularly good UI for that. Thunderbird 2 also took away the views dropdown, which was an eminently useful feature, and the only way I can find to replicate it is to create search folders, which are of course are a lot clunkier. Might be time for a downgrade. Update: You can add back the views dropdown from the customize menu. Sweet! PhotoMatt.net readers rock. 🙂