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Impress: If I want to use an Impress presentation with Powerpoint (or vice versa), I always use PPT format rather than PPTX, and keep the transitions/animations very simple.
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The more complex the file, then the higher chance of getting some glitches. My experience is that using files on both MS Office and LibreOffice is at least as compatible between using MS Office files on different versions of MS Office! For simple documents, spreadsheets, and presentations, the compatibility is quite high with MSO and LibO, in fact.
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