Mozilla Thunderbird is a project associated with Mozilla Firefox and is an email application that is available for free and works on open source and cross-platform. It also offers the features of chat, newsfeed, and newsgroup apart from being an email application. Being developed by Mozilla Foundation, the software application is compatible with Windows 7 version or more, Windows XP, Linux, etc. and is currently available in 56 languages. If you are using this application and is a Mozilla Thunderbird email client and have any questions or doubts, you can always contact Mozilla Thunderbird support and get in touch with technical masters at any time.