In fact, I believe the "ou" version might be common in 
Australia due to their spelling of certain English-language 
words.

I might be missing something here, so correct me if I'm wrong...
...but what the hell happened to English English?!

I think he missed the fact that Australians spell in English, while
Americans spell in US-English .... He doesn't realises that America
is the different was of spelling certain English-language words.

Kun-chan...