Thunderbird Calendar Extension
Lightning is a calendar extension for Mozilla Thunderbird. 
Site : http://www.mozilla.org/projects/calendar/
Once downloaded and installed, link to your emailanywhere calendar using the following steps:
- To setup your calendar, right click in the Calendar Name box. Select "New Calendar" option.
- Select "On the Network"
- Select "CalDAV" option and enter the location in the "Location" text box. The location would like something like this : https://<server>/dav/<email address>/Calendar
- Give the calendar a Name
- On the next screen you will be presented to enter your user name and password.
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