Lotus cc:Mail
Some (many) years ago in the DOS days there was a problem with cc:Mail and printing. After some investigation (thanks Norton utilities disk editor!) it came down to their print driver using US letter and the printers supporting A4. Obviously their support wasn't any support. But strangely when the story made the weekly comics of the time with the question of what exactly we were getting in the European version at near 1:1 exchange rate (vs probably 2:1 commercial rates) they changed the hardcoded 'LETTER' papersize into something more appropriate for us Europeans...