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How do I sync my Thunderbird calendar with my Google calendar?

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I have Thunderbird 10, and wanted to sync my Thunderbird calendar with my Google calendar. I went through the steps described, only to discover that Lightning 1.2.1 cannot be installed because it is not compatible with Firefox 11. I have the Provider for Google Calendar Add-on but can't install Lightning. Please advise on what I can do. Thanks.

I have Thunderbird 10, and wanted to sync my Thunderbird calendar with my Google calendar. I went through the steps described, only to discover that Lightning 1.2.1 cannot be installed because it is not compatible with Firefox 11. I have the Provider for Google Calendar Add-on but can't install Lightning. Please advise on what I can do. Thanks.

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