I've been using it for a few months now and I can say that it is indeed pretty stable. Outlook has been the least stable of the apps so far, but it's also the one I use the most and have tweaked quite a bit, so it could just be me.
OneNote isn't majorly different, except that it, like the rest of the apps, now uses the Ribbon interface. They've tweaked the search feature, too, and it is better than the old one.
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