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A method is presented for a user to receive an alarm about a pending calendar event, or an overdue to-do, from an electronic calendar System that Serves the user. The user accesses a network that connects the user terminal to a calendar System. The user Sends a Subscribe request for alarms, and then the user receives a notification in response to the Subscribe request, to notify the user about at least one alarm that was already triggered before the user accessed the network. This way, the user will obtain alarms that were triggered while the user was inaccessible, instead of missing the alarms altogether. This System includes a user terminal for accessing the network and Sending a Subscribe request Signal, as well as a calendaring unit that is responsive to the Subscribe request Signal, and is for providing to the user terminal a notification Signal indicating alarms that were already triggered before the network …