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I can't get English UK to become default it keeps going back to En glish USA. Is there a way to sport this out?

I can't get English UK to become default it keeps going back to En glish USA. Is there a way to sport this out?

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Make sure you downloaded and installed the English (British) version of Thunderbird. https://www.mozilla.org/thunderbird/all/

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Make sure you downloaded and installed the English (British) version of Thunderbird. https://www.mozilla.org/thunderbird/all/