There is an addon doing exactly what you want, downloadable from https://addons.mozilla.org/en-US/thunderbird/addon/5337. If you have any feature request please contact me (the author) by sending an email to mozilla@<mydomain> replacing <mydomain> with ingomueller.net. Thanks!
-- Allow calendar for birthdays from Thunderbird address book https://bugs.launchpad.net/bugs/174961 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
