This is Lightning 1.9b1 for Thunderbird 17.0.11pre and/or SeaMonkey 2.14, an intergrated calendar add-on. Also Timezone defintions for Mozilla Calendar and Provider for Google Calendar to allow bidirectional access to Google Calendar.
To install, drag and drop the xpi files on Thunderbird or SeaMonkey. Make sure to at least install both lightning.xpi and calendar-timezones.xpi before restarting the client.
Source is available at https://dryeo@bitbucket.org/dryeo/dry-comm-esr17
Dave Yeo
dave.r.yeo@gmail.com