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This may sound odd, but in Windows I used Excel for an outliner. Much nicer than Word. Excel allows outlining both vertically and horizontally, split screens in both axis, multiple columns like OmniOutliner, notes for each cell (although I found the app gets confused after about two thousand rows and note handling gets irratic). There is a limit to the amount of text you can put in a cell but unless you're writing a novel it isn't normally a problem.
YMMV of course, I used Excel primarily as a two dimensional database (albeit still text) with outlining as a way to try to get a handle on the sheer volume of data. A side of effect of this is that I never printed the whole thing out.