Conditionally install feature not working in Wix?

My Question to you is where is IISVERSION Property set. I don't use IIS schema in WIX but the built in Properties for other extensions are documented with their schema, I don't see a IISVERSION in the documentation for IIS schema. I found this reference here http://stackoverflow.com/questions/471424/wix-tricks-and-tips to search the registry for the version number of IIS (It is the second hint/tip if sorted by vote count).

As far as I know, the custom actions from the standard WiX extensions (like IIsExtension) are tied to the component conditions to execute.

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