Looking for Calendar/Task software

want free utility to run in background on pc

[HelenDev]

I use Outlook at work and make use of the calendar, tasks and reminder features.

At home I use Thunderbird for mail, but would like some calendar/reminder type utility so I can be as organised at home as I am at work!

Anyone got any recommendations?

Looking for something free, pref open source, stable, not adware or anything nasty obviously. Would like something which will run in the background if possible and remind me to do stuff even if I forget to open/look in the calendar!

[HelenDev]

I think I just answered my own question...

... just found moz calendar for thunderbird, looks pretty good...