Had the same issue with my 2008 International window. Pull the screws from the inside and look carefully around the seal where the water is entering(Hint, follow the rusty screws!). Also, look for wet insulation to assist you. I ended up sealing inside and outside of the window. Inspect the outside seal very close and look for cracks. Water sits on the top lip and lower lip of window. This is where mine was coming in.
Funny post, because this morning I noticed my other window dripping from the inside...and sure enough a check of the outside seal revealed a gap/crack in the caulking. So, lesson learned...when one window is in need of new sealant, keep on going and do them all.
Condensation is common in these windows, but I have found that if it is dripping down the wall, that means you have a leak.
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