Same in Sweden, it's only really used for sending wedding greetings. The reason is that telegrams are seen as the most formal mode of communication, because on

Same in Sweden, it's only really used for sending wedding greetings. The reason is that telegrams are seen as the most formal mode of communication, because once upon a time it was faster delivered and more expensive than a hand-written letter. Although there now exists many modes of communications that are way, way, faster, it retains the traditional formality, and is therefore used in traditionally formal settings, such as weddings.