A while back there was a bug in the old browser definition files that shipped with .NET 2 and .NET 4. Fast forward to today and these older ASP.NET’s will mis-detect IE10 and IE11. If you have this, you'll see __doPostBack JavaScript errors in your sites when IE10 or IE11 hit them. This whole concept has been long-fixed in ASP.NET 4.5. If you have a .NET 4 app you put .NET 4.5 on it and you're set. We don't sniff like this anymore. Two years ago there was a backward-fix to all versions of ASP.NET on all OSs including .NET 2, 3, and 4. However, I'm still getting email from folks who are seeing this, which means they've got very unpatched installations. Aside : If you don't have this two year old patch, be sure to check...(read more)
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