Patent ID: 8768332

Claim:
A cellular telephone comprising: a personal information management component comprising an interactive calendar that stores an event object; and an update component in communication with the personal information management component, wherein the update component performs operations comprising sending, to a remote device, an authentication code comprising a telephone number associated with the cellular telephone and information that is different from further information included in the event object to register the cellular telephone to receive events and event updates from the remote device, receiving, from the remote device via a communications network, the event object, storing the event object in the interactive calendar, receiving, from the remote device via the communications network, an updated object comprising the authentication code and indicating that a date associated with an event represented by the event object has changed, authenticating a remote user associated with the remote device using the authentication code to determine that the updated object originates from a known remote user with which the cellular telephone has registered to receive the events and the event updates, identifying the event object in the interactive calendar based upon the updated object, updating the event object using the information included in the updated object, generating a notification comprising a message that indicates that the event object has been updated, displaying the notification on a screen of the cellular telephone to inform a user of the cellular telephone that the event object has been updated by the updated object, the notification indicating that the date associated with the event has changed, determining that the notification has been viewed at the cellular telephone, generating a return receipt that indicates that the updated object has been viewed at the cellular telephone, and transmitting, via the communications network, the return receipt to the remote device.