"Sorry! Bing Twitter Search is not available in this locale." is about as useful as a chocolate teapot to anyone outside of the United States who wishes to take adantage of Microsoft's Twitter search facility that they launched recently.
Has Bing just indexed US-based Twitter accounts or does it only want US-based people to see the results?
(Maybe its the latter, if its only sold advertising inventory to US clients)
Bing Twitter Search is not available in this locale."
- Bing Twitter (view on Google Sidewiki)