We are thrilled to announce the launch of Thunderbird 115 “Supernova” for Linux, macOS, and Windows. This release represents a significant update to the software, both visually and technically, while still maintaining the familiar and flexible Thunderbird experience. “Supernova is the beginning of a new era for Thunderbird,” says Ryan Sipes, Thunderbird’s Product and Business Development Manager. The update includes features such as a modernized Cards View, a new Thunderbird logo, a dynamic unified toolbar, improved calendar design, customizable density settings, sortable Folder Modes, and improved accessibility. This is just the beginning, as we have plans for many more improvements and new features in the future. You can upgrade to Thunderbird 115 now and experience the future of Thunderbird!
https://blog.thunderbird.net/2023/07/our-fastest-most-beautiful-release-ever-thunderbird-115-supernova-is-here/