Thunderbird v.2.0.0.0 has decided to stop storing preferences such as which columns I want displayed and what I want shown in the tool bar. I have tried changing the permissions on the files in Docs & Settings > App Data > Thunderbird (in XP), but that does not seem to be the problem.

Any suggestions?

Got an answer at MozillaZine. Window display preferences seem to be stored in localstore.rdf, which is in the particular profile folder (e.g., in Windows, it’d be C:\Documents and Settings\USERNAME\
Application Data\Thunderbird\Profiles\WEIRDNUMBEREDPROFILE\localstore.rdf. (Adjust the all caps parts to your particular environment.) Close Thunderbird and delete (or rename) localstore.rdf. Open Thunderbird, and make your changes. A new copy of localstore.rdf will be automatically generated. Ta-da!

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