Review for Provider for Google Calendar by Mark L
Rated 3 out of 5 stars
It would seem it is possible to sync Google Calendar with Thunderbird. You WILL require the Lightning Add-On. It sure would have been nice if someone published the answer instead of the vague "I know but you don't" reply...
So here it is:
http://www.google.com/support/calendar/bin/answer.py?answer=99358#sunbird
Substitute Thunderbird for Sunbird, and the directions work fine.
PS. Save your $10 Provider support fee for a beer.
To create your own collections, you must have a Mozilla Add-ons account.