Ha ha. Very good! What I was thinking about is the portability of documents or ppt from libre office to Microsoft products and back. Usually a disaster for me. I would think saving as doc or docx would be sufficient but the fonts are not consistent. Going from Microsoft office to libre office is not quite as bad but then you are limited when trying to edit. Especially if equations are involved. Also pdf document do not look as good using evince. At least that is my experience. Good thing I can use Latex!