Hello,
the newest version has a serious bug (annoyed me yesterday):
https://bugzilla.mozilla.org/show_bug.cgi?id=1530820
Can You pull back the newest version from distribution?
Thanks 
Shalom
F.
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You can find older versions here if you wish to downgrade.
https://sourceforge.net/projects/portableapps/files/Mozilla%20Thunderbir...
Thanks! I had a backup, so that was no problem
And with portableapps it is be easy to roll back, no registry etc.