The Mozilla Calendar Project released Lightning and Sunbird
0.5 today, a major update to their free, open source
calendar extension and calendar client.
Lightning and Sunbird 0.5 offer a user interface update,
event invitations, printing improvements and better
integration with Mozilla Thunderbird.
Lightning and Sunbird 0.5 are immediately available for
Windows, Mac, or Linux operating systems in 22 languages as
free downloads from the
Calendar Project homepage.