When looking for a more recent version of Sunbird than 0.3 I stumbled over a release of today with version 0.6a1. It seems they renamed Sunbird to "Calendar" and the nice green bird is gone, too. I did not find any links to offical news on this so please let me know if you have more details on this. The release I found is located here: http://ftp.mozilla.org/[..]/2007-01-14-03-trunk/