Best Free Calendar Program

I am obsessed with being on time and I am almost always several minutes early to everything. But I also have trouble with remembering the exact date for up coming events. I do have my windows mobile phone for myself  but I also have a need for a calendar on my computer so I use Sunbird. Now you could ask why am I using Sunbird  instead of outlook that comes with windows mobile devices or even windows calendar that’s with vista . Well you see I need to create calendars that can be printed out  and Sunbird lets me do that. You can print calendars        that just list events or a full monthly calendar. I don’t even print out the calendars anymore I print them as PDF files and email them. Sunbird is made by Mozilla the same one’s who make Firefox so you know its good. You can get it at www.mozilla.org/projects/calendar/sunbird/.