As for all of those other accounts my account has access to being in a single profile - maybe it's an Outlook 2013 thing, but they are all there now by default.
I logged into a new computer, setup Outlook 2013 - bam all of those aforementioned accounts show up in the list down the left side.
Perhaps I didn't see them on my desktop because I always have my folder list open and there's enough of them that they push the other users accounts off the bottom...
Thought I would pass that along.