.NET Framework 3.5 SP1 end of support
Is .NET Framework 3.5 SP1 still supported?
Yes Supported
.NET Framework 3.5 SP1 is supported until January 9, 2029.
Key dates Vendor-confirmed
| Release date | November 19, 2007 |
|---|---|
| Support ends | January 9, 2029 |
Notes: Microsoft's .NET Framework lifecycle page (Component policy) lists this version's start and end dates. Microsoft: beginning with Windows 10 version 1809 and Windows Server 2019, .NET Framework 3.5 SP1 is a standalone product under the Fixed policy; before that it is a component of the Windows version it is installed on.
Source quality: Every date shown is confirmed in the vendor's own content; anything shown as Unknown is not yet confirmed anywhere.
What the end of support means
- After the final end date the software keeps running, but the vendor no longer ships fixes or security patches. Known vulnerabilities stay open, and compliance or cyber-insurance requirements may treat it as unsupported software.
Upgrade paths
Upgrade to a supported .NET Framework version
Staying on the same product usually means the least retraining. Check the upgrade path and system requirements in the vendor documentation; some upgrades must go through an intermediate version.
Buy more time
Some vendors sell extended or paid security support after the standard end date. Check the vendor's lifecycle page for this version.
Sources
Vendor lifecycle page for the product: https://dotnet.microsoft.com/download/dotnet-framework
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