June 2024 is now the ETA for Azure Functions “In Process” model to supported for .NET 8, on Windows at least. An update yesterday from Principal Program Manager Matthew Henderson on the team states:
Work is ongoing, and we’ve made good progress. The core artifacts needed are ready, so rollout is the next step. At this point we can now set an ETA: our current goal is to enable support on Windows in June. We have a few more details to figure out for Linux, but custom images should be supported at the same time as Windows.
As a reminder, you have until November 2024 to upgrade your .NET 6 functions to .NET 8, either to the “In Process” or “Isolated Worker” models.
My take on this is that if you believe there’s any possibility that your .NET 6 Azure Functions will still be useful in late 2026, you would be better off spending the time migrating over to the “Isolated Worker” model now. Here’s the guide on that:
Migrate .NET apps from the in-process model to the isolated worker model
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