I almost never use OpenOffice or LibreOffice, either - so the information on this page may be outdated. That's simply because I don't have MS Office on this Mac computer. I'm going to collect information that I believe to be workable, without having done a huge amount of testing. I personally use LyX because it's got the smoothest formula editor out there.
Most likely, this case also applies to the situation where the sender is you. This can happen, especially if the person in question has experienced the agony of upgrading Office first-hand and therefore can empathize with your desire to avoid Word. Same as above, but the sender of the document is willing to export the document to a more portable format. This applies for example when the sender is a federal funding agency, or a lawyer. The sender of the document is unable or unwilling to export the document to a more portable format.
Someone is sending you a Word document that you'd like to convert to LaTeX because you'd like to make modifications that require mathematical typesetting.
This page is for LaTeX users who face one of three scenarios: