Download and install Thunderbird email client if you have not already done so.
- Go to www.mozilla.com/thunderbird.
- Click Download, save to your desktop, and Run the file to install Thunderbird.
Do Not Use Sunbird
Sunbird is not recommended. Mozilla has suspended its development in favor of Lightning.
Download and install Lightning.
- Go to www.mozilla.org/projects/calendar/.
- Click Download Lightning, save to your desktop, and Run the file to install Lightning.