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.
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