I think what we have here isn't a deliberate effort to extinguish a standard, but a clash between two different cultures. LKML follows traditional hacker norms, from the days of actual terminals and slow connections, whereas Outlook is built for the world of GUIs, WYSIWYG, and more or less high-speed connections. The latter is what the vast majority of people have chosen, so it's a sensible business decision for Microsoft to not pay much attention to the old ways. It's just unfortunate when those two worlds collide.