How to make make a .NET COM object apartment-threaded?

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You can inherit from StandardOleMarshalObject or ServicedComponent for that effect:

Managed objects that are exposed to COM behave as if they had aggregated the free-threaded marshaler. In other words, they can be called from any COM apartment in a free-threaded manner. The only managed objects that do not exhibit this free-threaded behavior are those objects that derive from ServicedComponent or StandardOleMarshalObject.

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