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http://www.linuxveda.com/2014/11/29/never-use-micr... 
In addition to format incompatibilities, Microsoft – with OOXML – has introduced elements which may lead the user into producing a non interoperable document, such as the C-Fonts (for instance, Calibri and Cambria).
C-Fonts are the default choice for MS Office documents, but their license forbids users of other office suites to adopt them for any document (as you must own a Microsoft Office license).
So, a LibreOffice user who receives an OOXML document will be able to open it properly, but the document will not look the same because the C-Font will be automatically replaced by another font.
Most of the times, the LibreOffice user will think that the document does not look the same because of LibreOffice and not because Microsoft intentionally induced him into this “visual incompatibility”.
In addition to format incompatibilities, Microsoft – with OOXML – has introduced elements which may lead the user into producing a non interoperable document, such as the C-Fonts (for instance, Calibri and Cambria).
C-Fonts are the default choice for MS Office documents, but their license forbids users of other office suites to adopt them for any document (as you must own a Microsoft Office license).
So, a LibreOffice user who receives an OOXML document will be able to open it properly, but the document will not look the same because the C-Font will be automatically replaced by another font.
Most of the times, the LibreOffice user will think that the document does not look the same because of LibreOffice and not because Microsoft intentionally induced him into this “visual incompatibility”.
Young professional woman and busy mom.