[Bug 810622]

[Doberkid]

This seems to work for me:

Adding Calendar Tab:
Ctrl+Shift+C
OR
Events and Tasks menu, then click on Calendar

Making Google the Default Calendar:
Once Thunderbird starts -> Go to the Calendar tab and Right Click on the Google Calendar which you want the events to be processed by
Click on Properties
Select the Email -(gmail in this case – the calendar you want to make as default for accepting invitations)
OK-> Close

Hope this helps

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https://bugs.launchpad.net/bugs/810622

Title:
  Invites can only be accepted into local calendars

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