As of Thunderbird 1.3.6, the extra folder columns are gone !?
Onderwerp: Thunderbird
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As of Thunderbird version 1.3.6, some nice but apparently less-used features were stripped, and are now only available as add-ons:
- Extra Folder Columns: Shows the number of messages and size of folder next to foldername
https://addons.mozilla.org/en-US/thunderbird/addon/extra-folder-columns
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