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.NET Framework Support LifeCycle

The support for the .NET Framework Service Pack 1 (SP1) has already ended. Therefore, SP1 is not covered under the current support policy. However, Microsoft will continue to support the .NET Framework Service Pack 2 (SP2) until either support for the .NET Framework ends or for 12 months after the .NET Framework Service Pack 3 (SP3) is released. https://support.microsoft.com/gp/lifeDevTool

Microsoft will offer a minimum of 10 years of support for Business and Developer products. Mainstream support for Business and Developer products will be provided for 5 years or for 2 years after the successor product (N+1) is released, whichever is longer. Microsoft will also provide Extended support for the 5 years following Mainstream support or for 2 years after the second successor product (N+2) is released, whichever is longer. Finally, most Business and Developer products will receive at least 10 years of online self-help support.

You may visit this link to learn more on how does Microsoft Support LifeCycle works https://support.microsoft.com/gp/lifePolicy