I have a vague memory of flying a CO 738 or 739 about a year ago, somewhere in the row 7 through 10 range, and finding that seatguru had not reported a window missing on the left-hand side. Unfortunately, that's the seat I had reserved.

I also think that I found, after the flight, that the missing window was shown on an alternative seating configuration for the same plane. I remember filing a report to seatguru, but I don't believe that (since their takeover by Trip Advisor) they take any notice of passenger submissions any more. So caveat emptor, seatguru may not be a good authority here.

In the "good old days" of hard copy timetables, some of the better airlines would actually show the window locations on their seating charts (LH and SR come to mind). A very simple, cheap, and easy thing to do -- and very valuable to those of us who value a window seat, not just a fuselage seat -- but obviously beyond any notions of customer service these days.