LTS releases are supported for three years after the initial release. Not all features in an update will work on all devices. For the respective end of support dates, see this site. Recompiling of apps to target these versions is not necessary. The following table lists .NET Core versions no longer supported. Public Shared Function GetBusinessDays(startDay As DateTime, endDay As DateTime) As Integer Dim today = Date.Today Dim weekend = {DayOfWeek.Saturday, DayOfWeek.Sunday} Dim businessDays = From d In Enumerable.Range(0, (endDay.Date - startDay.Date).Days + 1) Select day = today.AddDays(d) Where Not weekend.Contains(day.DayOfWeek) Return businessDays.Count() End Function. End of support refers to the date when Microsoft no longer provides fixes, updates, or online technical assistance. The support lifecycle for various versions of Windows can be found on the Windows lifecycle fact sheet. On operating systems prior to Windows 10 version 1809 and Windows Server 2019, .NET 3.5 SP1 assumes the same lifecycle policy as the underlying OS on which it is installed. Once a patch update has been installed, applications will begin using the update by default. In such cases, the license allows you to deploy applications built on the specified .NET, ASP.NET Core, Entity Framework Core preview to production environments and provides access to Microsoft Support. Support for ASP.NET Core 2.1 on .NET Framework matches the ASP.NET Support policy for other package-based ASP.NET frameworks. The complete list of packages covered by this policy can be seen in ASP.NET Core 2.1 Supported Packages. .NET Framework 4.7.2: Support for .NET 4.7.2 follows the Lifecycle Policy of the parent OS. The .NET Framework 4.5.2 and later versions are compatible, in-place updates on top of the .NET Framework 4, 4.5, and 4.5.1. Update availability may vary, for example by country, region, network connectivity, or hardware capabilities (including, for example, free disk space). For assisted support with .NET technologies, contact a Microsoft Support Professional. Originally published: July 18, 2016Updated: July 9, 2020. Community support is a great way to get help and even contribute to the projects. The following table tracks release dates and end of support dates for .NET Core and .NET 5 versions. Microsoft said this week that it will support Visual Basic on.NET 5.0 but will no longer add new features or evolve the language. .NET Framework versions 2.0, 3.0, and 3.5: These versions are supported under a single product lifecycle policy. Additionally, there are several fixes included in these versions that will only be enabled if you choose to recompile your application against them. This means that an application, such as Exchange, built using the .NET Framework 4 or 4.5 will continue to run without any changes when the .NET runtime is updated from .NET Framework 4, 4.5, or 4.5.1 to later versions. For more information, see the Community page. There are a very small number of changes/fixes in .NET Framework 4.5.2 and later versions that are not fully compatible with earlier .NET versions. The support lifecycle for applicable pre-releases is as follows. It is supported as a Windows component on the latest required operating system update for Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8.1 Update, Windows 10 version 1607, Windows 10 version 1703, Windows 10 version 1709, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016 and Windows Server version 1709. .NET Framework 4.5.1: Support for .NET Framework 4.5.1 on all operating systems ended on January 12, 2016. Components may be shipped with the product included in a product service pack or update or released at a later date as a web download. Please go here to search for your product's lifecycle. That's why the end of support is a bit longer than three years from the original release date. Looking for the support policy for another part of the .NET platform? Knowing key dates in this lifecycle helps you make informed decisions about when to upgrade or make other changes to your software. .NET Framework 4.5.2 and later versions are compatible, in-place updates on top of .NET Framework 4, 4.5, or 4.5.1. Within a release's support lifecycle, systems must remain current on released patch updates. .NET Framework 4.5: .NET Framework 4.5 shipped both in Windows 8, Windows Server 2012 and as a stand-alone redistributable package. .NET Core 1.x was released under an earlier definition of LTS. LTS releases will be supported for 3 years after general availability, or for a 12-month Maintenance period after the next LTS release ships, whichever is longer. .NET Framework 4.7: Support for .NET 4.7 follows the Lifecycle Policy of the parent OS. Every Microsoft product has a lifecycle. EDITED: .NET Framework 3.5 SP1 Lifecycle Policy answer. As a product, .NET 3.5 SP1 will receive 5 years of mainstream support followed by 5 years of extended support. The length of time and degree of support vary based on a few qualifications. Support for .NET Framework 4, 4.5, and 4.5.1 ended on January 12, 2016. If a system is running 3.1 and 3.1.x has been released, 3.1.x will need to be installed as a first step. .NET Framework 4.7.1: Support for .NET 4.7.1 follows the Lifecycle Policy of the parent OS. Terms for Windows to remain supported support Professional and end of support on 12. 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