Just a quick heads up. I just created and saved an Excel file using Excel 2016, which cannot be opened again with it. Glad our swiss army knife LibreOffice can 😉
It’s funny to see Excel can open the ODS I created using LibreOffice (as source I used the XLSX file) better than it’s “native” format….
Here is a short “proof” video: https://youtu.be/bM7UOkqQTqw