New versions of open source email client Thunderbird are available for download — with either a handful of new features or a shedload, depending on which you pick. Thunderbird 140 is the latest monthly update, while Thunderbird 140 ESR is the newest ‘extended support maintenance’ release (that businesses, enterprises and home users who set a dependable, stable base and unchanging UI can opt for). Until recently, most Thunderbird installs would track ESR releases, but at the start of 2025 that changed. New installs (those downloaded from the Thunderbird website) now follow the monthly release cadence, which brings new features to […]You're reading Thunderbird 140 Released with New Features, a blog post from OMG! Ubuntu. Do not reproduce elsewhere without permission.