M$ will release a browser that runs on my operating system over their own dead body, or when browsers are so old-hat and obsolete that they no longer care. If then.
And even if they did, I don't want it. I run the dang-blasted monster in an emulator just so I can test my pages. If I weren't writing HTML for the great unwashed masses, there's no way I'd have *any* proprietary web browser installed on my computer.
Of the two, though, Opera deffinitely causes the least pain. Customizing O7 a bit, I'm pretty happy with it so far. It at least competes with Mozilla, which is more than I can say for IE, which just sucks so badly I don't see how anyone can stand it.