because all other ODF implementations just copied OpenOffice spreadsheet implementation (including non standard OpenOffice namespace) and Microsoft chose to implement Excle spreadsheet in ODF under a non standard MS office namespace.
The ODF specs allows both the OpenOffice nonstandard approach and the MS Office non standard approach as the standard itself does not speciffy what spreadsheet format to use.
As long as OOo Calc was the leading spreadsheet producing ODF everybody just copied that but not that MS Office also produces ODF it is likely all other parties will have to support both ODF 'regional' dialects.
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