Mozilla Sunbird - Portable Edition is the handy Mozilla Sunbird calendar packaged with a PortableApps.com Launcher as a portable app, so you can take your schedule and to-do list with you.

Sunbird Portable is a standalone calendaring and task management application built on the same technology as the Firefox web browser. It's easy to use and makes keeping your calendar and tasks up-to-date a breeze. Plus, it leaves no personal information behind on the machine you run it on, so you can take your schedule and to do lists with you wherever you go.