In terms of international support, Windows Phone 7 does still have some catch up to do, but Microsoft is pushing hard to increase international support in the next update of WP7, code-named Mango. Microsoft is including added support for 17 new languages in WP7, 20 new keyboard layouts, and will increase Marketplace purchase availability to a total of 35 countries.
In a blog bost from the Windows Phone team today, it was announced that Mango will be expanding its international appeal by adding 17 display languages to the system. Originally, WP7 only supported English, French, German, Italian and Spanish. Mango will expand support to Brazilian Portuguese, Chinese (simplified and traditional), Czech, Danish, Dutch, Finnish, Greek, Hungarian, Japanese, Korean, Norwegian (Bokmål), Polish, Portuguese, Russian, and Swedish.
Mango will also update support for 20 new keyboard input languages including: Brazilian Portuguese*, Czech,
Japanese*, Korean*, Malaysian, Norwegian*, Polish*, Portuguese*, Russian*, Simplified Chinese*, Swedish*, Traditional Chinese*, Turkish, and Ukrainian. (*denotes support for predictive text)
Microsoft has also promised support for purchases in the Marketplace to increase to 35 total countries this fall, and to expand the availability of Xbox LIVE support to more countries, though they have not made any specific announcement as to where that gaming support will land.
source: Windows Phone Blog
via Phone Scoop