Bem-vindo as Extensões para o Thunderbird.
Adicione recursos e estilos extras para tornar o Thunderbird só seu.
FecharAnálise de Provider for Google Calendar por Sina Momken
Avaliado em 4 de 5 estrelas
Also TB has Google Calendar integration by default using CalDAV protocol but after searching through web I found out that this addon has some little more features and is easier to setup.
Plus this addon provided Google Calendar support before Google support CalDAV itself.
I gave it 4 star because it doesn't support Google Tasks syncing with Lightnings' tasks.
Para criar as suas próprias coleções, você deve ter uma conta no Mozilla Add-ons.