Not long after the official version of .NET Framework 4.0 was released, Microsoft planned to abandon .NET 3.0/3.5.
The .NET Framework was originally released in 2002 and is regarded as a major product by Microsoft (equal to Windows and Office). Therefore, it enjoys a 5+5 life cycle strategy of five years of mainstream support and five years of extended support. This is also the longest in Microsoft's product line. Common forms of support.
Microsoft said that it is working hard to promote .NET 3.5 SP1 and the latest .NET 4.0 to become key components of the Windows operating system, so their life cycle will depend on the Windows 7 system as the parent product and so on. Windows 7 already has .NET 3.5 SP1 built-in directly, so its popularization is not a problem.
The old version of .NET 3.0/3.5 will end mainstream support on April 12, 2011, which means that after one year, Microsoft will no longer provide technical support and product design or functional changes for them, and will only retain paid support and security updates. , non-security hot fixes are only valid for users who purchase the extension agreement.
Microsoft recommends that all users upgrade and migrate to .NET 3.5 SP1 or .NET 4.0 as soon as possible.