Hi, today, it is quite common for services to send an iCal file or microdata (according to schema.org) as part of the e-mail notification, allowing the recipient to easily save the reminder to their calendar. In the case of a library, this could be a reminder of a book return date, a reminder of a registration expiration, etc. Including the correct address, opening hours and contact details. Do you think such a feature could be part of Koha notifications?