Thunderbird is the leading free and open-source email, calendaring, newsfeed, and chat client with more than 20 million active monthly users across Windows, macOS, and Linux. One of Thunderbird's core principles is the use and promotion of open and decentralized standards.
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So the release was postponed to Tuesday
Hi Thunderbird family, we have just a bit of housekeeping and cleanup to do before we release version 115, so we're going to hold off until tomorrow (Tuesday) to press the launch button. Thank you so much for your patience. We know it's been a long wait. We just want to ensure the smoothest launch possible!