> Where do the "can't have" rules come from, anyways? For umlauts, restricting the amount of support calls from people abroad where the keyboard doesn't have t

> Where do the "can't have" rules come from, anyways? For umlauts, restricting the amount of support calls from people abroad where the keyboard doesn't have them. For others, particularly when mainframes or other truly old legacy systems are involved, encoding issues somewhere along the transport chain.