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Hidden Archive Prefs 0.1 Requires Restart
Exposes hidden archiving preferences that allow the user to choose whether or not they want to keep the current directory structure when archiving and if they want to create folders yearly or monthly (or just keep it in one folder).
This add-on has been marked as experimental by its developers
This add-on is not compatible with your version of Thunderbird because of the following:
About this Add-on
UPDATE: As of Thunderbird 5.0, this add-on is useless. The preferences it exposes are now available under Tools > Account Settings > [account] > Copies & Folders > Message Archives > Archive options...
A known bug exists that adds extra space to the preference pane when the tab provided by this extension is in focus. It does not affect functionality.