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 4,996,596 websites that are Mobile Optimized Customers. We know of 1,377,848 live websites using Mobile Optimized and an additional 3,618,748 sites that used Mobile Optimized historically and 637,278 websites in the United States.
Get a list of 4,996,596 websites using Mobile Optimized which includes location information, hosting data, contact details, 1,377,848 currently live websites and an additional 1,531,596 domains that redirect to sites in this list. 3,618,748 sites that used this technology previouslyand 637,278 websites in the United States currently using Mobile Optimized.
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