See https://www.mozilla.org/en-US/thunderbird/38.4.0/releasenotes/ for list of changes.
Updates may require up to 24 hours to propagate to mirrors. If the following command doesn't work, please retry later:
sudo dnf upgrade --refresh --advisory=FEDORA-2015-6d64c257cfPlease login to add feedback.
This update has been submitted for testing by xhorak.
This update has been pushed to testing.
works for me
This update has reached 14 days in testing and can be pushed to stable now if the maintainer wishes
This update has been submitted for stable by bodhi.
Works fine...
This update has been pushed to stable.