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You can choose from hundreds of community-contributed add-ons to customize Thunderbird's UI, or you could write one yourself. https://addons.mozilla.org/en-US/

• bresc 12y ago
  Really? :) If TB looks like 2002 than the themes look like 1998
  • e15ctr0n 12y ago
    So write your own. :-) https://developer.mozilla.org/en-US/Add-ons/Thunderbird https://developer.mozilla.org/en-US/Add-ons/Thunderbird