It is available for all supported Ubuntu operating systems
Mozilla officially released the Mozilla Thunderbird 15.0 email and RSS client to the world on August 28th, 2012, bringing a few interesting new features.Thanks to Canonical, Mozilla Thunderbird 15.0 has just arrived a few hours ago on the Ubuntu 12.04 LTS, Ubuntu 11.10, Ubuntu 11.04 and Ubuntu 10.04 LTS.
Among the nice features added to Thunderbird 15.0, we can mention that Ubuntu One is one of the online storage providers Filelink, the Do Not Track option was added, Chat integration was added, and, of course, the new Australis user interface has been implemented.
All Ubuntu 12.04.1 LTS, Ubuntu 11.10, Ubuntu 11.04, and Ubuntu 10.04 LTS users can update their Thunderbird email client to version 15.0 right now, by using the Update Manager software.
Download Mozilla Thunderbird 15.0 for Linux binaries and sources right now from Softpedia. Also, don't forget to visit our always up-to-date Thunderbird Extensions section for the latest add-ons.