Took a consulting gig with RedHat once. RedHat asked for a document. I gave them a LibreOffice .odt doc (that I wrote on Fedora). They rejected that doc due to inability to access it. I sent them a LibreOffice exported .docx file and they again rejected it due to formatting issues. At that point they specifically requested I use Word and send them a Word document.

Microsoft Word makes the world go round. Sure I can use Wordpad and export a docx file, but no tables, no special effects, etc