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Episode 200 of The Modern .NET Show is out, and it is a public service announcement instead of a retrospective. Microsoft's support for .NET 8 and .NET 9 ends on 10 November. Check their lifecycle pages before acting on that; one of these dates has already moved once.

First, the reassuring part, in Microsoft's own words: "Applications built on .NET 8 or .NET 9 will continue to run." No kill switch, no licence check, no expiry. What stops is the supply of security fixes for problems found after that date.

The rule I would keep from it: across three pairs of similar names, the one with Core in its name, or the higher version number, is the one with a deadline. .NET Framework, System.Web and Windows PowerShell 5.1 follow Windows instead.