[Totoradio]

About your second point, I just tested it on my machine, Word 2016 saves and opens *.odt files just fine. Is there some unsupported stuff?

[nileshtrivedi]

Yes, their implementation is (deliberately?) patchy with many bugs. They've been lobbying to prevent governments from adopting ODF (an open ISO standard with multiple implementations): https://www.theregister.co.uk/2014/02/22/microsoft_uk_odf_re...