Supportability of .NET Framework 1.1 on Windows 7 and Windows Server 2008 R2
Based on customer feedback the team has published a clarification regarding the Microsoft.NET Framework on Windows 7 and Windows Server 2008 R2. The Microsoft .NET Framework 1.1 is not supported on Windows 7 and Windows Server 2008 R2, so customers are encouraged to test their applications against the latest version of the .NET Framework and update them to make use of the new features found in the latest version.
More information around support policies for the Microsoft .NET Framework can be found here: https://support.microsoft.com/gp/lifeandotnet
More information regarding new versions of the Microsoft .NET Framework can be found in the Knowledge Base Article 829019.