Well, that wipes out the "installable" explanation, since it doesn't apply to .eot format.
Obligatory stupid question: When you say "converted to EOT" you mean that you used a suitable font-conversion utility and really changed it, right? Not just put a different extension on the end? I am not trying to insult your intelligence, honest, just covering all possible bases.
Did you fine-tooth-comb it for case matching? This is something you'd want to do in any case, so doing it now isn't a complete waste of time. I know it gives me the willies when I meet a font name using different casings in different places. Most browsers-- or operating systems, or servers-- don't seem to care, but sooner or later there will be one that does. (Why does Opera, specifically, claim I don't have a font that I do have? Can it be pure coincidence that this font writes its name in ALL CAPS?)