Rated 1 out of 5 stars

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!

This review is for a previous version of the add-on (0.25).