O mozilla thunderbird it is a free app software to monitor your email or RSS feeds that interest you. The application is available on Microsoft Windows, Apple Macintosh and Linux operating systems.
Developed by the Mozilla Foundation Foundation and the first version was released on December 7, 2004. The first 1.000.000 downloads were made within 10 days of the first release. By 2007, the app had been downloaded 50.000.000 times.
A new version of it was released today email client thunderbird. Thunderbird version 78.2.0 is one information for the stable version of Thunderbird 78.0.
Thunderbird 78.0 is available for download from the project website and only supports MailExtensions and not the classic plugins that older versions supported. So there is a possibility that some plugins will no longer work in the new major version.
If you are already using Thunderbird 78.x you can check for upgrade from Help – About Thunderbird.
All the rest you are interested in the email client can be downloaded on the platform you needed from official webpage.