If you have Office, you already have OneNote, but not OneNote MX. OneNote is an electronic briefcase where you can jot down or type notes, grab video, record voice, mix and match all of the above, and organize the whole mess. The messes get synchronized through SkyDrive, so they’re always available. Microsoft has made OneNote apps for iPad/iPhone, Android, Windows Phone, and now, Metro. That’s where the “MX” in OneNote MX comes from.
As Microsoft’s flagship Metro app, OneNote MX packs a bunch of smarts, including Microsoft’s first industrial-strength implementation of radial menus. Very cool -- and it works with a mouse as well as a greasy finger. Don’t be confused: In the Windows Store, OneNote MX is just called “OneNote.”