Everything Is A Graph
And reading lots of Open Hyperdocument System info again. Which reminded me of Eugene Kim's paper (2002-03-26-b) on using graph structures to achieve InterOp (or at least data migration possibilities) among Collaboration Ware apps.
A Wiki is a graph.
If I write a Wiki Page in an outliner (Wiki And Outlining), then a single wiki page becomes a graph too! Then one could Version Control each node, make a wiki page Paragraph Addressable, etc. And maybe achieve CoOutlining.
And, if I'm about to drop MsOutlook for awhile (since I'm leaving my job, I won't be tied to MsExchange), is there an EMail/PIM client (on MsWindows, no money for new laptop) that is usable, but might allow me to integrate it into something I build, so I don't have to build those core bits? What about Mozilla?
An outline may be a graph, but a graph might not be an outline.