Application does the described job perfectly. If, however, you decide Entourage is no longer for you or that Mail has finally evolved enough that you want to use it instead, you're screwed. Software Update won't help. You have to download the combo updater from Apple and open it with third party software such as Pacifist to reinstall iCal. This author should provide an "uninstall" application for iCal via Entourage.