Quote:Microsoft published a .NET Framework lifecycle FAQ update on October 20, 2018 to highlight changes in regards to the end of support for the company's .NET Framework 3.5 software product.

The main change is that Microsoft considers the .NET Framework 3.5 a standalone product as opposed to a component of the operating system. The change begins with Windows 10 version 1809 and Windows Server 2019.

Microsoft plans to support the .NET Framework 3.5 with 5 years of mainstream support and 5 years of extended support. In other words: the company will support the Microsoft .NET Framework 3.5 until October 2028 with security updates.

Quote:.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.

Future operating system releases won't affect the support lifecycle of the .NET Framework 3.5.

Nothing changes for operating system versions prior to Windows 10 version 1809 and Windows Server 2019. The .Net Framework 3.5 is considered a component of the operating system and follows the same support cycle as the operating system itself (means support ends when the operating system reaches the end of the extended support phase).

Full reading: https://www.ghacks.net/2018/10/21/microsoft-details-net-framework-3-5-end-of-support/