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You do need - at the very least - Thunderbird 24 and Lighting 2.6, as they support the new option. Update: Google changed the authentication method of CalDAV on September 16. Lastly, you need a Google account with Google Calendar enabled as a service. The developers however have stated that the next version of Lightning will again support previous versions of Thunderbird as well. The requirements are the following: You need Thunderbird 8 or later at the moment as Lightning is only compatible with that version of the email client currently. Probably better than that is the integration of Google Calendar information into the Lightning add-on as it integrates better with Thunderbird.

In 2010 I reviewed the Thunderbird add-on Google Calendar Tab which integrates the service into Thunderbird by opening the Google Calendar web page in the email client. The normal installation of Thunderbird alone will not allow you to add your calendars. It can be used as a standalone application to complete sync with your calendars instead of the integrated calendar’s. Using Lightning is not the only way of integrating Google Calendar in Thunderbird. Thunderbird can be used to sync your calendars in a common place irrespective of Google, iOS, Yahoo, Windows etc. Both the Thunderbird desktop email client and the Lightning calendar add-on have been recently updated.
