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Mark Bourne wrote
The .docx format changes slightly with each version of MS Office.

So do the Microsoft Binary (DOC et al.) formats. Major revisions for DOC
were on 2009-07-13, 2010-06-07, 2012-01-20, and 2014-07-31.

Mark Bourne wrote
For compatibility between MS Office and LibreOffice, the older .doc format
is more reliable. 

Probably only because of the mechanics of this format (it is effectively a
memory dump to file). There have been many recent improvements to LO with
respect to supporting OOXML. The level of support may not be equal to that
for the MS Binary formats (yet) but it hopefully will be in the
not-too-distant future. TDF has partner organisations working on these
improvements. List of links to recent (2013-2014) blog posts about
improvements here:

Mark Bourne wrote
From my understanding, Office Open XML (OOXML - the format used in docx,
xlsx, and related files) is a
supposedly open standard. i.e. anyone can get the details of how to read
and write files in that format. But that standard allows some data to be
included in an application-specific format, which MS does to make it
easier for themselves to port MS Office to using it. Unfortunately that
means it's not so easy for anyone else to figure out how to read and write
those parts of the file. 

These compatibility blobs only exist in OOXML Transitional; OOXML Strict
essentially eliminates them.

Best wishes, Owen.

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