This takes the cake. Alex Brown has just admitted on his Griffin Brown blog and further to ZDNET UK's Peter Judge that Microsoft Office 2007 has failed two OOXML conformance tests he ran. First ZDNET:
In a blog posting this week, Alex Brown, revealed that Microsoft Office 2007 documents do not meet the latest specifications of the ISO OOXML draft standard.
"Word documents generated by today's version of Microsoft Office 2007 do not conform to ISO/IEC 29500," said Brown in a blog post recounting the process of testing a document against the "strict" and "transitional" schema defined in the standard.