You must have an up-to-date Mozilla Thunderbird email client installed on your machine. To start, download the Lightning extension available on the official Thunderbird modules website: https://addons.mozilla.org/fr/thunderbird/addon/lightning/ Une fois téléchargé, ouvrez votre logiciel Thunderbird. In Mozilla Thunderbird, look for “Add-ons” in the “Tools” menu. Click on the Install button, and indicate/select the file you have … Continue reading Mozilla Thunderbird with Lightning extension (Windows / Mac / Linux)