Exactly, the problem lies in the ~/.mozilla-
thunderbird/xyz1234.default/localstore.rdf settings file.

I can reproduce the problem quickly on Ubuntu Hardy with Dual Monitor.
My right monitor has a higher resolution than the left one.
I start Thunderbird, maximize it on the right monitor (that with the higher 
resolution), close Thunderbird.
When I open Thunderbird again, it opens in fullscreen on the left monitor and 
gets stucked in this setup. Nothing helps to change that outfit.

You can restore the windows border with these steps:
# Close Thunderbird
# Edit the file ~/.mozilla-thunderbird/xyz1234.default/localstore.rdf
# Search the entry
  <RDF:Description 
RDF:about="chrome://messenger/content/messenger.xul#messengerWindow"
                   width="800"
                   height="600"
                   sizemode="normal"
                   screenX="5"
                   screenY="5" />
# Change the width, height and screenXY entries to the ones you see here
# Restart Thunderbird and it should have its borders again.

-- 
Thunderbird starts in a full-screen mode and cannot be restored
https://bugs.launchpad.net/bugs/196058
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