You are encouraged to use Thunderbird ESR (Extended Support Release) and corresponding compatible Lightning plugin. According to Mozilla Team "Thunderbird Extended Support Release (ESR) is intended for groups who deploy and maintain the desktop environment in large organizations such as universities and other schools, county or city governments and businesses". | You are encouraged to use Thunderbird ESR (Extended Support Release) and corresponding compatible Lightning plugin. According to Mozilla Team "Thunderbird Extended Support Release (ESR) is intended for groups who deploy and maintain the desktop environment in large organizations such as universities and other schools, county or city governments and businesses". |