Microsoft invented the MobileOptimized META tag to control the layout width for mobile markup rendered in Internet Explorer Mobile.
http://msdn.microsoft.com/en-us/library/bb159711.aspx
Mobile
Get access to data on 5,022,547 websites that are Mobile Optimized Customers. We know of 1,699,233 live websites using Mobile Optimized and an additional 3,323,314 sites that used Mobile Optimized historically and 737,866 websites in the United States.
Get a list of 5,022,547 websites using Mobile Optimized which includes location information, hosting data, contact details, 1,699,233 currently live websites and an additional 1,505,494 domains that redirect to sites in this list. 3,323,314 sites that used this technology previouslyand 737,866 websites in the United States currently using Mobile Optimized.
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