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The following bit of Applescript should automate Derek's suggestion:

tell application "OmniOutliner Professional"
	set MyDoc to front document
	repeat with MyRow in every row of MyDoc
		if (length of (note of MyRow as string)) > 0 then
			set note expanded of MyRow to true
		end if
	end repeat
	tell MyDoc to set note display to in line
end tell