A new version of *Thunderbird* is released in Debian shortly after each Tails release, because both *Tails* and *Thunderbird* follow the [[release calendar of *Firefox*|https://whattrainisitnow.com/calendar/]]. As a consequence, until Tails 7.5 (February 2026), the version of *Thunderbird* in Tails was almost always outdated, with known security vulnerabilities.
By installing *Thunderbird* as additional software, the latest version of *Thunderbird* is installed automatically from your Persistent Storage each time you start Tails.
<p>To reopen this page after restarting Tails, choose <b>Apps ▸ Tails ▸ Tails Documentation</b> and go to <b>Documentation ▸ Uncensored and anonymous Internet ▸ Emailing and reading news with Thunderbird</b>.</p>
Tails detects that you have both the **Thunderbird Email Client** and **Additional Software** features of the Persistent Storage turned on and automatically adds *Thunderbird* to your list of additional software.
Tails also tries to install as additional software the language package that corresponds to the language of this Tails session, if it exists. To use *Thunderbird* in another language, see [[using *Thunderbird* in another language|thunderbird#language]].