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Web Setup fails on IIS7

As we were deploying a  WCF service via web setup projects on Windows Server 2008 with IIS 7.0, the setup failed with the installer saying

"The installer was interrupted before [my app] could be installed. You need to restart the installer to try again."

Of course after restarting the installer, the exact same error occurred again. :-)

It seems that the MSI package is using the Metabase feature of IIS6. As this is not installed by default on an IIS7 machine, you get an error. Installing the IIS 6 Metabase Compatibility Component solves the issue. (it's situated under Role Services in the Server Manager)

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