Hi 
If this is for an article then i am not sure we can really help.
Mostly we are all just volunteers and can't give the TDF's official
stand-point on any of this. All we can give is anecdotes which
doesn't really count as proof!
Over the years we have often heard about problems with the MS format
on this mailing list but very seldom heard about problems with our
format on their systems!
Quite why the problems weren't being raised as bug-reports against
MS's apparently poor implementation is a bit of a mystery. MS admit
to making "accidental" mistakes in their implementation of their own
format and we get the blame. It was the same with the Rtf format and
even now that MS have lost the court case about their 'accidents' with
Rtf people still seem to think that everyone else was to blame. It
might be interesting to compare the similarity of the promises for
interoperability made by MS for both formats over the years and the
types of 'accidents' that both formats have suffered.
We know for certain that Excel 2010 and previous versions of MSO
implemented ODF support so badly that formulas got replaced by
hard-coded values. However, over the years this only got reported to
us 1 or 2 times.
What we don't know is whether people experienced the problem and took
it as a sign to avoid Open Document Formats in favour of proprietary
implementations of other formats or whether people were simply not
using ODF much at all and so never noticed the problem.
Perhaps people expected formats to only work on the systems they were
written in, ie that the much vaunted "interoperability" was a complete
myth and only applied to machines running the same OS and the same
version of the same programs. That certainly seems to be the
prevelant attitude amongst office workers i work with.
Anyway, i personally think MS Office is only just attempting to
correctly implement the format because ODF is only just beginning to
be used widely enough that people are beginning to question why it
works so well on everything except MS's stuff.
Regards from
Tom 