The addon lets you set the format of the dates used for the year and month folders that the Archive function in Thunderbird 3+ creates. It exposes the (hidden) preference that lets you change the granularity of the folders to either a single folder; an archive folder and a year subfolder; or a month also.

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Additionally the addon can add modifiers to the 'A' key shortcut so the key is Shift + A (or Control or Alt).