ST-2026-024 · Runtimes & developer platforms
Azure Functions ends support for the .NET in-process model on 10 November
Microsoft will end support for the .NET in-process execution model in Azure Functions on 10 November 2026 and directs C# function applications to the isolated worker model for continued full support.
Previous state
Azure Functions v4 C# applications could remain on the .NET in-process model, which supports LTS releases through .NET 8.
Current state
The in-process model leaves support; continued full support requires migration to the isolated worker model, which supports additional .NET versions and a separate worker process.
Affected users
Who needs to care
C# Azure Functions applications using the in-process execution model, including applications on Functions v4 and .NET 8.
Required response
What to do
Identify in-process applications, assess extension and binding compatibility, migrate projects to the isolated worker model, run functional and performance tests, and deploy before the support deadline.
Evidence boundary
What the source does not prove
This is an execution-model support deadline, not a statement that every in-process app stops running on the date. It is distinct from .NET 8's own support lifecycle even though both currently show 10 November 2026.
Connected NeoLinks intelligence
Related evidence across the network
Curated because the records share a publisher, platform, control, sector or procurement context. Each destination keeps its own evidence boundary.
British Heart Foundation's Azure Functions integration layer
The support deadline is technical lifecycle evidence; PlatformTrace records an operating UK implementation that includes Azure Functions.
Asda's Azure Functions and API platform migration
Asda's Scan & Go rebuild provides an enterprise-use context for the runtime family covered by this lifecycle record.
Lifecycle history
Dated event sequence
- Current migration guidance published
Microsoft's Functions v3-to-v4 guidance states the in-process support deadline and recommends isolated worker migration.
- Support ends
Azure Functions support for the .NET in-process model is scheduled to end.
Evidence ledger
First-party sources
- 01Microsoft Learn — Migrate apps from Azure Functions version 3.x to version 4.x
Official .NET execution-model migration guidance · 2025-09-30
Open official source ↗