Interactive personal information management system

1. 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.

2. The cellular telephone of claim 1 , wherein the updated object comprises a cancelation that deletes the event object, and wherein the update component receives the cancelation directly from the remote device via a WiFi communication.

3. The cellular telephone of claim 1 , wherein the updated object comprises a cancelation that deletes the event object, and wherein the update component receives the cancelation from the remote device via a remote server.

4. The cellular telephone of claim 1 , wherein the communications network comprises a cellular communications network.

5. A method comprising:

sending to a remote device, by a cellular telephone comprising a personal information management component comprising an interactive calendar, an authentication code comprising a telephone number associated with the cellular telephone to register the cellular telephone to receive events and event updates from the remote device;

receiving, from the remote device via a communications network, a plurality of event objects;

storing, at the cellular telephone, the plurality of event objects in the interactive calendar;

receiving, at an update component of the cellular telephone via the communications network, an update for a corresponding event object of the plurality of event objects, the update comprising the authentication code and indicating that a date associated with an event represented by the event object has changed, the update being received from a remote device;

authenticating, by the cellular telephone, a remote user associated with the remote device to determine that the update originates from a known remote user with which the cellular telephone has registered to receive the events and the event updates;

updating, by the cellular telephone, the corresponding event object based upon the update;

generating, by the cellular telephone, a notification comprising a message that the corresponding event object has been updated at the cellular telephone;

displaying, by the cellular telephone, the notification on a screen of the cellular telephone to inform a user of the cellular telephone that the corresponding event object has been updated, the notification indicating that the date associated with the event has changed;

determining, by the cellular telephone, that the notification has been viewed at the cellular telephone;

generating, by the cellular telephone, a return receipt that indicates that the notification has been viewed at the cellular telephone; and

transmitting, by the cellular telephone via the communications network, the return receipt to the remote device to indicate that the update has been received by the cellular telephone, and that the cellular telephone has updated the interactive calendar at the cellular telephone based on the update.

6. The method of claim 5 , further comprising:

receiving a new event object including information about a further event;

updating the personal information management program by adding the new event object to the interactive calendar; and

displaying a further notification indicating receipt of the new object on the screen of the cellular telephone.

7. The method of claim 5 , wherein the communications network comprises a cellular communications network.