Hi Andres, ...
You might be able to report it to the libreoffice team and people there might have a quick work around until they reverse engineer the problem. Or confirm that MS office is not playing ball with open document formats. I would make sure you are running the latest version of libreoffice as well. Maybe not as far as the developer version though.
Interesting. You suggest that the ODS written by LibreOffice is non-standard (as we know, strictly speaking), so that MS Office is not able to deal with it. I never thought of that. However I suspect that Microsoft does it on purpose in order to give ODF a bad reputation. What I don't understand is why Sun's ODF plugin doesn't work. With 75MB to play with! Maybe the developers were so occupied with ODT that they forgot about ODS.
Cheers, Theo