There is no such thing as VFP 6 certification......
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I'm not sure what you mean, but the original question referred to VFP6 and VFP7 certification and while there are two exams listing VFP6 in the title (http://www.microsoft.com/traincert/mcp/mcsd/requirements.asp), there are none listing VFP7. I assume that's what Evan meant.