Google calendar client setup
Google Calendar with Outlook
Google Calendar with Thunderbird Lightning
It is possible to synchronize with Google_Calendar from within Lightning, see http://www.google.com/support/calendar/bin/answer.py?answer=99358#sunbird.
initial import of google calendar may cause thunderbird to freeze,
creating a task from thunderbird lightning in google calendar fails with:
Error number: MODIFICATION_FAILED
Alternatively see https://addons.mozilla.org/af/thunderbird/addon/provider-for-google-calendar/ (requires Thunderbird 3.1 or later). We have not yet tested the latter.