Microsoft has just updated the lifecycle page of the .NET Framework, showing that starting with Windows 10 version 1809 and Windows Server 2019, the 3.5 release will be considered a standalone product and will be supported by 2028. In previous versions of Windows 10, the .NET Framework was considered an integrated component of the operating system, so support was discontinued after the new OS was released.
But with the arrival of Windows 10 October 2018 Update (1809), .NET Framework 3.5 has been seen as a standalone product – meaning it has five years of mainstream support and five years of extended support.
“.NET Framework 3.5 SP1, beginning with Windows 10 version 1809 and Windows Server 2019, is a standalone product and receives 5 years of mainstream support followed by 5 years of extended support. For operating systems released prior to Windows 10 version 1809 and Windows Server 2019, .NET 3.5 SP1 remains a component of the Windows version on which it is installed.”
The Windows 10 Creator Update (1703) has been discontinued this month, and subsequent official security updates are not available. As for the other versions, it will continue as a branch of the LTSC for the education and enterprise markets.