RPM of the first Release Candidate of the new major version of messaging client is available in remi-test for Fedora ≥ 12.
As this is not yet the stable version, a backup of your profiles seems mandatory (.thunderbird folder)
As always:
yum --enablerepo=remi-test update thunderbird
enigmail (version 1.1) extension is also available.
lightning extension will come soon... Thunderbird 3.1 RC1
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