El equipo de Mozilla libero el primer beta de Thunderbird 5, no habrá versión 4 ya que llevara la misma numeración que Firefox y tendrán la misma fecha de salida, lo nuevo de Thunderbird 5 beta es:

  • New Addons Manager and extension management API (user interface will be changed before final release)
  • Tabs can now be reordered and dragged to different windows
  • Revised account creation wizard, offering improved set-up
  • Attachment sizes now displayed along with attachments
  • New troubleshooting information page to aid supporting and diagnosing problems in Thunderbird
  • Plugins can now be loaded in RSS feeds by default
  • Various other user interface fixes and improvements
  • Support for Mac 32/64 bit Universal builds (Thunderbird Beta will no longer support PowerPC on Mac)
  • and numerous other bug fixes
Podemos instalar los repositorios de Thunderbird 5 beta  en Ubuntu, abrimos una terminal y añadimos lo siguiente
sudo add-apt-repository ppa:mozillateam/thunderbird-next
sudo apt-get update
sudo apt-get install thunderbird thunderbird-locale-es