That OneNote app is actually really good. If they make an Outlook for RT, it better be a real app and not a desktop program to be added to the 4 programs that I hardly use in which they already give you for the desktop. With all the power of a Outlook program, it would be too hard to use on the desktop. I tried looking for a solution to run more desktop apps, but after all this time i've been using my Surface, I've been noticing I have the opposite habits from being a desktop user. In my opinion, on an RT device, everything should be apps, no in-between, on a desktop, nearly everything you use is all on the desktop. It's interesting to analyze what gets used the most from device to device.
I tried adapting to the apps on my desktop, and after a while it just wasn't working for me. Now i'm seeing the same trend on my Surface, but with desktop apps. Too hard to use.