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I've followed all the steps as described in numerous blog posts, including the MSDN Walkthrough, on setting up User Defined Functions in Excel Services. However, I'm still getting "#NAME?" in the function fields.

Is there additional configuration that needs to be done? Do I need to use REGASM to register a COM object for it to work? If so, doesn't that mean it'll need to be registered on all client machines?

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It seems that I was targeting the wrong framework. It was using 4.0, not 3.5. Found this in the logs after an IISReset.

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