See the description in 8.10's thunderbird package, which should be fairly clear:
Description: mail/news client with RSS and integrated spam filter support Thunderbird is a lightweight mail/news/RSS client, based on the Mozilla suite. It supports different mail accounts (POP, IMAP, Gmail), has an integrated learning Spam filter, and offers easy organization of mails with tagging and virtual folders. Also, more features can be added by installing extensions. ** Changed in: mozilla-thunderbird (Ubuntu) Status: New => Fix Released -- [gutsy] Search for 'email' in gnome-app-install does not find thunderbird https://bugs.launchpad.net/bugs/138947 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