Solved!
It was due to the Lightning extension. I had the version 0.7 of
Lightning installed and the Ubuntu installation updated Thunderbird but
not the Lightning extension. Funnily Thunderbird did not complain about
the incompatible Lightning extension. Anyway after uninstalling
Lightning and
** Attachment added: tbirdbug.png
http://launchpadlibrarian.net/13914835/tbirdbug.png
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lost screen real estate with ubuntu 8.04 upgrade
https://bugs.launchpad.net/bugs/46
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