Mozilla Sunbird is a cross-platform calendar application, built upon Mozilla Toolkit. Will provide you with full-featured and easy to use calendar application that you can use around the world.
Portable Sunbird is a fully functional package of Sunbird optimized for use on a USB key drive.
It has a specialized launcher that will allow most of your favorite extensions to work as you switch computers... well, once Sunbird has extensions that install into the profile, that is.
Sunbird Portable is a standalone calendaring and task management application built on the same technology as the Firefox web browser.
Portable Sunbird is a Sunbird functional package.
It will also work from a CDRW drive (in packet mode), ZIP drives, external hard drives, some MP3 players, flash RAM cards and more.
