Microsoft to buy app-development startup Xamarin - MarketWatch
"Xamarin ... raised $82 million in three funding rounds from venture-capital firms
... person close to the deal pegged the price at between $400 million and $500 million"
ScottGu's Blog - Welcoming the Xamarin team to Microsoft
Microsoft’s Acquisition of Xamarin is Good News for C# Developers @ InfoQ
Mobile App Development & App Creation Software - Xamarin