> so what would be the difference between using a Japanese OS and using an
> English OS + Japanese MUI?

Why not use English OS + Japanese IME?

-- 

Kindly
Konrad
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May all spammers die an agonizing death; have no burial places;
their souls be chased by demons in Gehenna from one room to
another for all eternity and more.

Sleep - thing used by ineffective people
            as a substitute for coffee

Ambition - a poor excuse for not having
                 enough sense to be lazy
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