How do I disable it permanently?
Don't have similar issue in Tb3 ( Linux version ).
See following method fix this issue.
Close Tb.
Goto Tb profile folder.
Rename 'localstore.rdf ' file to 'localstore.rdf.renamed'.
Start Tb.
Disable Mail Toolbar.
Restart Tb.
Does the customization remain in effect?
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JoeS Using TB3
http://kb.mozillazine.org/Thunderbird_3.0_-_New_Features_and_Changes
https://developer.mozilla.org/en/Thunderbird/Thunderbird_Binaries
...i had similar problem (TB3, win XP SP3)...when i disabled (unchecked)
the Mail Toolbar it appeared again after restart or even when i changed
to different tab...
...i found out it was caused by an extention in my case ("Ab in tab" -
an experimental extention opening address book manager in new tab
instead of opening it in new window)...so it might be caused by some
extention for you too...
jan