Thunderbird 1.0 doesn't do activities and notes at all, but then neither did Outlook 1.0. I recommend asking someone to make an extension to do that -- it's an obvious enhancement that lots of people will want (personally I hate those features -- I'd rather litter my desk with bits of paper). You can ask for new extensions at the forums here: http://forums.mozillazine.org/. Just ask.
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.