Even though Microsoft’s UserVoice section covers Windows 10, suggestions for related apps sometimes sneak in. About 18,000 people want support for a modern LaTeX editor in Microsoft Office.
“In 2009, LaTeX was used to typeset 96.9% of publications in mathematics, 89.1% of publications in statistics, 79% of publications in physics, and its use is widespread in computer sciences, engineering, geosciences, astronomy, ecology, chemistry, biology, medicine, psycology, and political and social sciences,” the submission claims. It’s used for all sorts of textbooks as well.
LaTeX is public software, although its license includes an odd provision: Modified files must be clearly marked as such to distinguish themselves from the original. That might possibly break Microsoft’s file format. (The original license prevented any modified file from using the filename of the original file.)