Omnifocus 1 for Mac Synching with iCal

I have Mac OS 10.7.5 and still have OF 1 for mac. I notice that when I open iCal, many of my due dates appear on my ical which I like. However, I can see the dates only up for the current month.

Is there a preference I need to select or deselect in order to see all due dates in ical?