According to Rob Weir's blog, Microsoft's  325-page OOXML specification for spreadsheet formulas is deeply flawed.  From basic trigonometric functions that forget to specify units, to statistical  functions, to critical financial functions — the specification does not  contain correct formulas that could possibly be implemented in an interoperable  way.  
http://developers.slashdot.org/article.pl?sid=07/07/11/0015240&from=rss  
Microsoft's OOXML format is seriously flawed
 
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