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LibreOffice is right about Microsoft, and it matters more than you think.
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
Yeah, the issue is not "Microsoft's usage of the XML format". The issue is that they blatantly bought their format's standardization, and then intentionally released an implementation that substantially deviated from the specs, making sure that MSO was the only "compatible" implementation.