Thunderbird FAQ | Thunderbird Help - Mozilla Support
https://support.mozilla.org/en-US/kb/thunderbird-faq
WebWhat is Thunderbird? Thunderbird is a free, open-source, cross-platform application for managing email, news feeds, chat, and news groups. It is a local email application, meaning it installs and runs as a client on your device, being rather than browser or web-based.
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