424 votesdogsolitude_uk commented
I'd also vote for this: now MS has bought Wunderlist this would be awesome addition to the Outlook/Onenote ecosystem. I love OneNote, but for quick lists (e.g. to-do lists, shopping lists) it's far too cumbersome. Likewise an Outlook Diary entry isn't appropriate for a to-do list either.
All three have a very distinct role to play, but it would be useful to be able to sync between them, e.g. link/sync to lists notes on OneNote, access lists from OneNote or Outlook, or set Outlook calendar appointments from lists, that kind of thing.