Microsoft noted that Mango would support multiple languages. How many? Try Brazilian Portuguese, Simplified and Traditional Chinese, Czech, Danish, Dutch, Finnish, Greek, Hungarian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, and Swedish. It just so happens that Nokia is strong in most of those regions with those languages.
New Windows Phone Marketplaces will open up around the world and China, Israel and Luxembourg will take app submission in those locales today.
Despite all the talk about better message threading, groups, social network and app integration, browsing tools and hands-free messaging, Microsoft is positioning Windows Phone 7 for a global game. It's quite possible that Windows Phone 7 and Nokia won't gain traction in the U.S.
And that may be ok. It's a big smartphone powered world. Windows Phone 7 and Nokia could do fine without breaking much ground in the U.S.