Review for Provider for Google Calendar by adeit
Rated 4 out of 5 stars
easy to use and gets 98%. overheads are slow on multiple calendars (6). Main drawback is the repeat function. This did not work
Lightning to Google - just got loads of incorrect entries suggests a feedback loop.
However Google to Lightning worked fine.
Config (XP (fully updated),Thunderbird 2.0.021, Lightning 0.9)
To create your own collections, you must have a Mozilla Add-ons account.