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 5,125,888 websites that are Mobile Optimized Customers. We know of 1,614,690 live websites using Mobile Optimized and an additional 3,511,198 sites that used Mobile Optimized historically and 698,902 websites in the United States.
Get a list of 5,125,888 websites using Mobile Optimized which includes location information, hosting data, contact details, 1,614,690 currently live websites and an additional 1,485,235 domains that redirect to sites in this list. 3,511,198 sites that used this technology previouslyand 698,902 websites in the United States currently using Mobile Optimized.
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