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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 36.0beta, first offered to channel users on February 16, 2015
Various older charsets have been removed
Thunderbird will no longer use SHA-1 to sign messages (bug 1018259)
CONDSTORE support has been disabled due to causing various issues (bug 912216)