I agree with the above recommendations. I would add to that that with these 2 tools (Outlook and OneNote) you could easily manage your activities with Outlook alone, or OneNote alone, or with the combination of the two.
I highly recommend the DavidCo Outlook Setup Guide. It describes an effective method for managing everything (including the Projects List, Someday/Maybe, etc.) within Outlook.
If you wished to do something similar in OneNote, you could manage your actions using Tags as your Contexts, and use the "Find Tags" and group by Tag Name or Title to review your lists by Contexts or Projects, respectively.
Start here: 7Breaths: GTD with OneNote: Set Up and continue with the "Full Series" links on the right side of the page.
Or, if you'd like to see a nice method of blending the two tools, I highly recommend the following blog series:
GTD with Outlook 2010 and OneNote 2010
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