I looked for the import of my google calendar into thunderbird following the guide you provide at this link: https://support.mozilla.org/en-US/kb/using-lightning-google-calendar. But since last November it is not possible to extract the XML-link from google calendar, they just provide iCal link. So I've tried to set up a new calendar with kind of link, configuring it as a ICS calendar but it does not work, because my appointments don't appear. How can I do? Thanks.