Besides all web installers and trail DVDs (including Visual Studio 2010 Express edition and Windows Phone Developer Tools) need a product to extend the evaluation period or upgrade/activate product permanently. While installing Visual Studio doesn’t prompt for product key (MSDN DVD or ISOs only) because it is pre-pidded product. Just like Windows and Office suite, Microsoft has implemented product activation and validation in Visual Studio 2010 to prevent piracy and provide additional benefits of genuine product. The most prominent question is asked by new Visual Studio players (IMO Users is not a suitable word for them).
