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Tried to use it. The doc said:
1 Open your Google Calendar -- OK!
2 Click on the Settings link located in the box at the right of the page. -- OK!
3 Click on the calendar you want to use with Thunderbird Lightning or Sunbird. -- I've just one ?
4 Click on either of the two XML buttons shown at the bottom. -- Never seen an XML button!

Questa recensione riguarda una versione precedente (0.25) del componente aggiuntivo.