Use Google Calendar from Thunderbird

If you are using thunderbird and the addon for using google calendar https://addons.mozilla.org/en-US/thunderbird/addon/4631 is not compatible (with the thunderbird version), follow these steps:

1. Open the Thunderbird/Sunbird application and select File > New Calendar.
2. Select On the Network and click Next.
3. Select the CalDAV format option.
4. In the Location field, enter [http://www.google.com/calendar/feeds/[full email id]/public/basic] and click Next.
5. Enter a name and select a color for your calendar.
   
6. Choose the email address as none. Proceed further.
   
7. In the pop-up screen, enter the following information:

   Username: This is the complete email address you use with Google Calendar (including the part after the @ sign).
   Password: This is the password you use to sign in to Google Calendar

8. Click OK.