Open Source Calander/Task Manager

[JSeibert]

I'm looking for a free or open source calander and task manager for Windows. I have Windows XP installed on a computer that I'm forbidden to install Linux on and can't find an application adequate enough to meet my needs.

I'm a full time college student who is also starting his own business. Needless to say I have a lot going on day to day. I started by making simple lists every morning of what I need to do but thats not practical. I need something simple that can just keep track of my tasks.

Any ideas?

[hard candy]

Treepad Lite (http://www.treepad.com/) I haven't used it but it is freeware- the lite version.

[Shep]

I use Evolution for that, plus it does email.