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Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users.
Join UsVersion 38.5.1, first offered to channel users on January 8, 2016
Use a SHA-256 signing certificate for Windows builds, to meet new signing requirements
Windows XP SP2 will not longer install Thunderbird (workaround: Install Thunderbird 38.5.0 then update)