Tails also tries to install as additional software the language package that corresponds to the language of your first session with Tails 7.5 or later. To use *Thunderbird* in another language, see how to [[use *Thunderbird* in another language|thunderbird#language]].
If the **Thunderbird Migration** dialog below appears when you start *Thunderbird*, it means that Tails successfully installed *Thunderbird* as additional software.
If the **Thunderbird Migration** notification below appears when you start Tails, it means that Tails failed to install *Thunderbird* as additional software because the [[Additional Software|persistent_storage/additional_software]] feature of your Persistent Storage is turned off.
Select **Install as Additional Software** next time you start Tails to turn on the Additional Softwarefeature of your Persistent Storage and add *Thunderbird* to your list of additional software.
If the **Thunderbird Migration** notification below appears when you start Tails, it means that Tails failed to install *Thunderbird* as additional software for unknown reasons.