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 4,624,193 websites that are Mobile Optimized Customers. We know of 1,794,305 live websites using Mobile Optimized and an additional 2,829,888 sites that used Mobile Optimized historically and 910,708 websites in the United States.
Get a list of 4,624,193 websites using Mobile Optimized which includes location information, hosting data, contact details, 1,794,305 currently live websites and an additional 1,436,972 domains that redirect to sites in this list. 2,829,888 sites that used this technology previously and 910,708 websites in the United States currently using Mobile Optimized.
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