See https://www.mozilla.org/en-US/thunderbird/38.4.0/releasenotes/ for list of changes.
For changes see:
This update has been submitted for testing by xhorak.
This update has obsoleted thunderbird-38.3.0-1.fc21, and has inherited its bugs and notes.
This update has been submitted for batched by bodhi.
This update has been submitted for stable by bodhi.
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