Is there an easy way to migrate from thunderbird to evolution?

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http://unix.stackexchange.com – I want to be able to use the calendar evolution: the calendar in Thunderbird is a plugin (Lightning) and from time to time when Thunderbird receives a new update, Lightning does not always update automatically as well. So I wanted to have it native in GNOME. Can anyone explain to me how to do this? (HowTos)