RPM of the new major version of messaging client is available in remi for fedora (backport of rawhide version).
As this is a new major version, a backup of your profiles seems mandatory (.thunderbird folder)
Start by reading :
Thunderbird Release Notes
As always:
yum --enablerepo=remi update thunderbird
enigmail (version 1.1.2) and lightning (version 1.0b2pre) extensions are also available.
A annoying issue with this version requires to register... Thunderbird 3.1
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