Billy Idol
Legend
It's. Not. That. Simple.
The UK, US, and Australia all use English as their official language, and guess what? The voice reco databases are different in each of those countries.
This is interesting, also what Joker found.
But I am still surprised. Germany has many dialects as well. People from Munic, Cologne or Berlin, all talk in different dialects and there are many more. Of course, it is the same in Austria (and german speaking Switzerland). A lot of those dialects (especially close the border) are even shared.
But in all those countries, there is a common base: standard German which nearly all people are capable of speaking and which should be the aim of a voice recognition device. I am not sure about the US, UK and Australia and if the people are capable of something like standard english. I hope that MS is not extrapolating those countries to other countries which look similar from the outside, but might be really different inside.