Mous 2007 office certifications

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Recently I been ask about Mous certifications if they are now at the exam centres, and where can they purchase if at all, the available literature or work guides to help them with the exams?
Of course the structures or base 2003 and even 2000 Mous certification books and guides are certainly a good start, but down the line more and more companys will be looking for the latest. So one may proceed with 2007 rather than 2003>
Does anyone have some info or sites that pertain to the above?
thank you