Find what version of Thunderbird you are using Click the Application menu button , then go to the Help menu and choose Troubleshooting Information. A new tab will open with information about your setup. Under Application Basics, refer to the number beside Version. That is the version of Thunderbird you are using. // These fine people helped write this article:Chris Ilias, Tonnes, Michele Rodaro. You can help too - find out how. Was this article helpful?