Sometimes, the genesis of a transformative idea came from unlikely, unrelated sources. Just ask Debbie Byrne. A number of years ago, the managing director of An Post Retail was listening to the radio when she heard how a woman, living in emergency accommodation, had failed to bring her daughter to a crucial medical appointment because she had never received the letter confirming the date.  Moving between locations, and with no permanent address, the letter did not reach her. Byrne listened to the story and figured the woman was not alone. However, unlike most people, she also figured she could do…