# Patent

## Title
Method and system for collecting contact information from contact sources and tracking contact sources

## Abstract

A method and system for aggregating contact information of contacts from multiple contact sources is provided. The aggregation system collects contact information for a user from various contact sources. The aggregation system stores the collected content information in a contact data store. The aggregation system may also store an indication of the contact source of the collected contact information. The aggregation system provides a user interface through which the user may search the contact information of the contact data store to find contact information of contacts that are collected from the different contact sources. The aggregation system allows a user to add a contact to a real-time contact list to enable real-time communications with that contact.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application is related to U.S. patent application Ser. No. 11/066.715 entitled “METHOD AND SYSTEM FOR AGGREGATING CONTACT INFORMATION FROM MULTIPLE CONTACT SOURCES” and U.S. patent application Ser. No. 11/067,615 entitled “METHOD AND SYSTEM FOR LOCATING CONTACT INFORMATION COLLECTED FROM CONTACT SOURCES, ” which are being filed concurrently and which are hereby incorporated by reference.
TECHNICAL FIELD
The described technology relates generally to providing contact information and particularly to providing contact information for real-time communications.
BACKGROUND
Real-time conversations between conversation participants via their computer systems are becoming increasingly common. Such real-time conversations require that the participants be present at their computer systems (e.g., personal digital assistants) and able to respond when a communication is received. A common form of real-time conversation is provided by instant messaging services. An instant messaging service allows participants to send messages and have them received within a second or two by the other participants in the conversation. The receiving participants can then send responsive messages to the other participants in a similar manner. To be effective, a real-time conversation relies on the participants' becoming aware of, reviewing, and responding to received messages very quickly. This quick response is in contrast to conventional electronic mail systems in which the recipients of electronic mail messages respond to messages at their convenience.
When an initiating participant wants to start a real-time conversation, that participant needs to know whether the intended participants are available to respond in real time to a message. If not, then communications via conventional electronic mail, voice mail, or some other mechanism may be more appropriate. For example, if the computers of the intended participants are currently powered off, then a real-time conversation is not possible. Moreover, if their computers are currently powered on, but the intended participants are away from their computers, a real-time conversation is also not possible. The initiating participant would like to know the availability of the intended participants so that an appropriate decision on the form of communication can be made.
The availability status of an entity such as a computer system or a user associated with that computer system is referred to as “presence information.” Presence information identifies the current “presence state” of the user. Users make their presence information available so that other users can decide how best to communicate with them. For example, the presence information may indicate whether a user is logged on (“online”) with an instant messaging server or is logged off (“offline”). Presence information may also provide more detailed information about the availability of the user. For example, even though a user is online, that user may be away from their computer in a meeting. In such a case, the presence state may indicate “online” and “in a meeting.”
In an instant messaging context, a publishing user (“publisher”) may provide their presence information to a presence server that then provides the presence information to subscribing users (“subscribers”). Thus, a presence server may use a subscriber/publisher model to provide the presence information for the users of the presence service. Whenever the presence information of a user changes, the presence server is notified of the change by that user's computer system and in turn notifies the subscribing users of the change. A subscribing user can then decide whether to initiate an instant messaging conversation based on the presence information of the intended participants. For example, if the presence information indicates that a publishing user is currently in a conference telephone call, then the subscribing user may decide to send an instant message, rather than place a telephone call, to the publishing user. If the subscribing user, however, needs to call and speak with the publishing user, the subscribing user needs to monitor the presence information of the publishing user to know when the call can be placed. When the subscribing user notices that the publishing user's presence information indicates that the telephone conference has been concluded, then the subscribing user can then place the telephone call.
Typical presence systems and/or instant messaging systems may allow a user to maintain a list of contacts to whom the user may subscribe to presence information or may send instant messages. The systems, referred to generically as a contact server, may store for each contact a display name of the contact along with the contact's real-time identifier, such as a Session Initiation Protocol (“SIP”) Uniform Resource Identifier (“URI”). The real-time identifier is a unique identification of the contact that can be mapped to the current location of the contact using SIP. When a user wants to send an instant message to a contact, a client-side component of the instant messaging system may download the contact list from the contact server. The client-side component allows the user to select the contact with whom the user wants to initiate the instant messaging session. The client-side component may also allow the user to maintain the list of contacts (i.e., “real-time contact list”) by adding new contacts, updating existing contacts, and so on.
Many different systems may be used by a user to maintain information about contacts for the user. For example, the user may use electronic mail systems, cellular phones, personal digital assistants, customer relationship management systems, operating systems, and so on to maintain contact information about the user's contacts. Electronic mail systems may allow a user to maintain a personal address book that includes entries for contacts that contain the name, electronic mail address, postal address, telephone number, real-time identifier, and so on of the contact In addition, electronic mail systems may allow an enterprise to maintain a global address list that contains entries for each person associated with the organization. Some electronic mail systems may maintain replicated copies of their contact information. For example, a personal digital assistant may contain a duplicate copy of the contact information that is also stored on an electronic mail server. From time-to-time, the contact information of the personal digital assistant needs to be synchronized with that of the server. In addition, some electronic mail systems allow users to input contact information from electronic business cards rather than requiring a user to manually input the contact information.
Because contact information can be maintained by many different contact sources, it can be difficult for a user to locate contact information for a contact. When a user wants to communicate with a contact, the user needs to remember in which contact source the contact information for that contact is stored. For example, the user may store telephone numbers of some contacts in a cellular phone and may store contact information of other contacts using an electronic mail system. In such a case, the user may first use the electronic mail system to see if it contains the contact information for a certain contact. If not, the user may next use their cellular phone to see if it contains the contact information. The user may repeat this process of checking contact sources until the contact information for the contact is located. Moreover, once a user locates the contact information, assuming it is not already in the real-time contact list of the contact server, the user would need to manually add the contact information to the real-time contact list before a real-time conversation can be initiated.
It would be desirable to have a system that would somehow allow a user to have a user interface through which the user can access the contact information from different contact sources, easily locate contact information of a contact of interest regardless of the contact source, and easily add contact information to the real-time contact list to enable real-time conversations.
SUMMARY
A method and system for aggregating contact information of contacts from multiple contact sources is provided. The aggregation system collects contact information for a user from various contact sources. The aggregation system stores the collected content information in a contact data store. The aggregation system may also store an indication of the contact source of the collected contact information. The aggregation system may subscribe to the presence information of contacts when their contact information includes a real-time identifier. The aggregation system provides a user interface through which the user may search the contact information of the contact data store to find contact information of contacts that are collected from the different contact sources. The aggregation system allows a user to add a contact to a real-time contact list to enable real-time communications with that contact.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a display page of the user interface of the aggregation system in one embodiment.
FIG. 2 illustrates a display page of the user interface provided by an application associated with a contact source in one embodiment.
FIG. 3 is a block diagram that illustrates components of the aggregation system in one embodiment.
FIG. 4 is a flow diagram that illustrates the processing of the perform initial collection component of the aggregation system in one embodiment.
FIG. 5 is a flow diagram that illustrates the processing of the receive update event component of the aggregation system in one embodiment.
FIG. 6 is a flow diagram that illustrates the processing of the search component of the aggregation system in one embodiment.
FIG. 7 is a flow diagram that illustrates the processing of the view contact information component of the aggregation system in one embodiment.
FIG. 8 is a flow diagram that illustrates the processing of the add to contact list component of the aggregation system in one embodiment.



DETAILED DESCRIPTION
A method and system for aggregating contact information of contacts from multiple contact sources is provided. In one embodiment, the aggregation system collects contact information for a user from various contact sources. For example, the contact sources may include a personal address book and a global address list of an electronic mail system (e.g., Outlook), an operating system address book (e.g., Windows Address Book), a real-time contact list provided by a contact server (e.g., Microsoft's Live Communications Server), and so on. The aggregation system may initially collect the contact information whenever the user logs on to a client computer system. The aggregation system stores the collected content information in a contact data store such as a database or another data store that is accessible via the client computer system. For example, the aggregation system may store the contact information in memory or on a disk drive of the client computer system of the user. The aggregation system may also store an indication of the contact source of the collected contact information. For example, when the aggregation system collects contact information from a personal address book of the user, the aggregation system identifies the personal address book as the contact source in the contact data store for that contact. The aggregation system may store additional information in the contact data store such as the telephone number, postal address, electronic mail address, real-time identifier, and so on. The aggregation system may subscribe to the presence information of contacts when their contact information includes a real-time identifier or sufficient information is provided to discover the real-time identifier. The aggregation system provides a user interface through which the user may search the contact information of the contact data store to find contact information of contacts that are collected from the different contact sources. The aggregation system allows a user to add a contact to the real-time contact list to enable real-time communications with that contact. In this way, the aggregation system provides a single user interface through which a user can access contact information stored in different contact sources.
In one embodiment, the aggregation system upon initialization collects contact information from the different contact sources and stores the contact information in the contact data store, which is created anew during each initialization. Although the contact information is up to date at the time of initialization, it may become out of date quickly. In particular, a user may go directly to a contact source and add, update, or delete contact information. The contact data store will thus become unsynchronized with the contact source. To ensure that the contact data store stays relatively synchronized with the contact sources, the aggregation system may register to receive update events from the contact sources. When the aggregation system receives an update event, it updates the contact information in the contact data store. Some contact sources may not provide update event notifications. If so, the aggregation system may periodically poll the contact sources to determine if any of the contact information has been updated. Whenever the aggregation system updates the contact data store, the user interface component of the aggregation system may be notified so that it can refresh its display.
In one embodiment, the aggregation system allows the contact information of a contact to be updated within the context of the user interface of the contact source. When the aggregation system collects contact information, it records the contact source of the contact information. When a user wants to update contact information for a contact, the aggregation system identifies the contact source from the contact data store and requests the application associated with that contact source to provide the user interface for updating the contact information. For example, if the contact source is a personal address book of an electronic mail system, then the aggregation system may use the API of the electronic mail system to provide a user interface for updating the contact information. When the user interface is displayed, the user may update the contact information in the context of the application associated with the contact source. Whenever the contact information of the contact source is updated, the contact source notifies the aggregation system so that it can update its contact data store accordingly. For example, when a user wants to update the real-time identifier of a user whose contact information was collected from an electronic mail system, the aggregation system may request the update user interface of the electronic mail system. When the user has updated the real-time identifier, then the electronic mail system may send an update event to the aggregation system indicating the new real-time identifier.
In one embodiment, the aggregation system allows a user to search for contact information about a contact. To search for the contact information, the aggregation system allows a user to enter a search criterion for a contact. The aggregation system searches the contact data store for contact information of the contacts that match the search criterion. The aggregation system may search various fields of the contact information, such as first name, last name, electronic mail alias, company name, and so on. Since the contact data store contains contact information from multiple contact sources, the search is effectively across multiple contact sources. The aggregation system may order the search results based on the contact source. For example, the aggregation system may order contact information from a personal address book before contact information from a global address list under the assumption that a personal address book contains the contacts that are most likely to be of interest to the user. The aggregation system may also subscribe to presence information for those contacts that match the search criterion (assuming that the contact information of a contact includes the real-time identifier) and display the presence information along with the contact information. The presence information may include additional information that may be more up to date than the contact information of the contact source. For example, the presence information may indicate a new telephone number for a contact or a telephone number at which the contact can be currently reached.
In one embodiment, the aggregation system allows a user to add a contact of a search result to the real-time contact list. When a user indicates to add a contact, the aggregation system may notify the contact server so that it can update its real-time contact list. After the contact server updates its real-time contact list, it may send an update event to the aggregation system. Upon receiving the update event, the aggregation system updates its contact data store. The aggregation system may also notify its user interface component so that it can refresh its user interface to indicate the contact that has been added to the real-time contact list.
FIG. 1 illustrates a display page of the user interface of the aggregation system in one embodiment. The display page 100 includes a search field 101, a results list area 102, an add to contact list button 103, a contact list area 104, and a presence information area 105. When the display page is first displayed, the contact list area contains an entry for each contact of the real-time contact list (using scroll bars as appropriate). A user enters a search criterion into the search field to perform a search. The aggregation system searches the contact data store for contacts that match the search criterion. As the user enters the search criterion, the results list area is updated to reflect the contacts that match the portion of the search criterion entered so far. For example, the results list area may be updated after each character of the search criterion is added or removed. The aggregation system may search various fields of the contact data store including first name, last name, company, electronic mail alias, and so on. The aggregation system may also allow a user to perform searches based on other information of the contact data store. The aggregation system may provide an “advanced search” button to specify additional search criteria such as phone number, division, location (e.g., postal address), job title, and so on. Although not shown, the results list area and the contact list area may also include presence information for the contacts if available. The results list area and the contact list area also contain an identification of the contact source. A blank contact source indicates that the contact information for the contact was added directly into the real-time contact list without having any other contact source. When a user wants to add a contact of the results list area to the real-time contact list, the user selects the contact in the results list area and then selects the add to contact list button. The aggregation system notifies the contact server of the addition to the real-time contact list. The contact server updates its real-time contact list and sends an update event to the aggregation system. Upon receiving the update event, the aggregation system updates its contact data store and refreshes the contact list area of the display page. When a user selects a contact from the results list area or the contact list area, the aggregation system may display presence information and other contact information in the presence information area. When a user selects a contact from the results list area or the contact list area, the aggregation system directs the application associated with the contact source to provide a user interface for viewing and modifying the contact information of that user.
FIG. 2 illustrates a display page of the user interface provided by an application associated with a contact source in one embodiment. The display page 200 represents the user interface provided by Microsoft Outlook for maintaining contact information of a personal address book. The aggregation system invokes the APIs of Outlook passing the identification of the contact whose information is to be edited. Outlook then displays the display page with the contact information of the identified contact. When the contact information is updated by a user, Outlook sends an update event to the aggregation system. Upon receiving the update event, the aggregation system updates its contact data store and refreshes its user interface as appropriate. One skilled in the art would appreciate that each contact source may provide its own user interface for maintaining contact information. Alternatively, the aggregation system could provide a uniform user interface for updating contact information and invoke the APIs of the associated applications to effect the updating of the contact information at the contact source.
FIG. 3 is a block diagram that illustrates components of the aggregation system in one embodiment. The aggregation system 310 interfaces with contact sources 320 and a presence server 330. The contact sources may include a global address list 321, a personal address book 322, a Windows address book 323, and a contact server 324. The contact server maintains the real-time contact list. The entries of the real-time contact list include real-time identifier, display name, and contact source. The aggregation system includes a perform initial collection component 31 1, a receive update event component 312, and a poll for update component 313, which are used to maintain the contact data store 314. The aggregation system also includes a search component 315, an add to contact list component 316, a view contact information component 317, and a subscribe to presence information component 318. An instance of the aggregation system executes on each client computer system and stores at the contact information for the contacts of a logged-on user. When the aggregation system is initialized, the perform initial collection component is invoked to collect contact information from the various contact sources. The perform initial collection component initializes the contact data store by storing the collected contact information in it. The contact data store may be emptied prior to storing the collected information. The receive update event component is invoked when an update event is received from a contact source. The receive update event component updates the contact data store as appropriate and may notify a user interface component to refresh the user interface. The poll for update component may be invoked periodically to check for changes in contact information of contact sources that do not provide event notifications. The search component is invoked when a user specifies a search criterion. The add to contact list component is invoked when a user indicates to add a contact to the real-time contact list. The view contact information component is invoked when a user wants to view contact information of a contact in the context of the application associated with the contact source. The subscribe to presence information component is invoked to subscribe to the presence information of a contact as provided by the presence server.
The computing device on which the aggregation system is implemented may include a central processing unit, memory, input devices (e.g., keyboard and pointing devices), output devices (e.g., display devices), and storage devices (e.g., disk drives). The memory and storage devices are computer-readable media that may contain instructions that implement the aggregation system. In addition, the data structures and message structures may be stored or transmitted via a data transmission medium, such as a signal on a communication link. Various communication links may be used, such as the Internet, a local area network, a wide area network, a point-to-point dial-up connection, a cell phone network, and so on.
Embodiments of the aggregation system may be implemented in various operating environments that include personal computers, server computers, hand-held or laptop devices, multiprocessor systems, microprocessor-based systems, programmable consumer electronics, digital cameras, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and so on. The computer systems may be cell phones, personal digital assistants, smart phones, personal computers, programmable consumer electronics, digital cameras, and so on.
The aggregation system may be described in the general context of computer-executable instructions, such as program modules, executed by one or more computers or other devices. Generally, program modules include routines, programs, objects, components, data structures, and so on that perform particular tasks or implement particular abstract data types. Typically, the functionality of the program modules may be combined or distributed as desired in various embodiments.
FIG. 4 is a flow diagram that illustrates the processing of the perform initial collection component of the aggregation system in one embodiment. The component is invoked when the aggregation system first initializes. The component may initially empty the contact data store. In blocks 401-407, the component loops selecting each contact source and each contact within each selected contact source and adding the contact information to the contact data store. The component may also subscribe to presence information of contacts in the real-time contact list. In block 401, the component selects the next contact source. In decision block 402, if all the contact sources have already been selected, then the component completes, else the component continues at block 403. In block 403, the component selects the next contact of the selected contact source. In decision block 404, if all the contacts of the selected contact source have already been selected, then the component loops to block 401 to select the next contact source, else the component continues at block 405. In block 405, the component adds the selected contact to the contact data store. The information added to the contact data store includes an indication of the contact source of the contact and a unique identifier of the contact within the contact source. The unique identifier may be used to correlate contacts in the real-time contact list with the corresponding contacts in their contact sources. In decision block 406, if the selected contact source is the contact server, then the component continues at block 407, else the component loops to block 403 to select the next contact of the selected contact source. In block 407, the component subscribes to the presence information of the selected contact and then loops to block 403 to select the next contact of the selected contact source.
FIG. 5 is a flow diagram that illustrates the processing of the receive update event component of the aggregation system in one embodiment. The component is invoked when the aggregation system receives an update event from a contact source. In decision block 501, if the update event indicates that a contact has been added to the real-time contact list, then the component continues at block 502, else the component continues to process another type of event. Other update events may be received from other contact sources and may indicate that a contact has been added to or removed from a contact source or that the information for the contact has been updated at the contact source. When such events are received, the component updates the contact data store and signals the user interface component to refresh the user interface. In block 502, the component stores the contact information in the contact data store. In block 503, the component signals to the user interface component of the aggregation system to refresh the user interface. The component then completes.
FIG. 6 is a flow diagram that illustrates the processing of the search component of the aggregation system in one embodiment. The component is passed a portion of the search criterion that the user has entered so far. In block 601, the component performs a search of the contact data store based on the passed search criterion. In block 602, the component sorts the results of the search based on the contact source from which the contact information was collected. The component may subscribe to the presence information of those contacts in the results of the search whose presence information is not already subscribed to (assuming the contact information of the contact includes a real time identifier). The component may display the contact's presence information as part of the results. In block 603, the component displays the search results and then completes.
FIG. 7 is a flow diagram that illustrates the processing of the view contact information component of the aggregation system in one embodiment. The component is invoked when a user indicates to view contact information associated with a selected contact. The component requests the application associated with the contact source of the selected contact to provide the user interface for editing the contact information of the selected contact. In block 701, the component retrieves the contact information of the selected contact from the contact data store. In block 702, the component sends a request to the application associated with the contact source to edit the contact information of the selected contact. If the application is not currently executing, then a new instance of the application may be launched. When the application program detects that contact information has been updated, it may send an update event to the aggregation system so that it can update the contact data store. The component then completes.
FIG. 8 is a flow diagram that illustrates the processing of the add to contact list component of the aggregation system in one embodiment. The component is passed an indication of a contact and notifies the contact server to add the passed contact to the real-time contact list. The component may also subscribe to the presence information of the newly added contact. In decision block 801, if a real-time identifier is provided with the contact information of the contact, then the component continues at block 802, else the component continues at block 803. In block 802, the component subscribes to the presence information of the contact. In block 803, the component notifies the contact server to add the contact. When the contact server completes the adding of the contact, it sends an update event notification to the aggregation system so that the aggregation system can update its contact data store as appropriate. The component then completes.
From the foregoing, it will be appreciated that specific embodiments of the aggregation system have been described herein for purposes of illustration, but that various modifications may be made without deviating from the spirit and scope of the invention. In one embodiment, the aggregation system may attempt to match information from different contact sources that are for the same contact. Once the information from multiple contact sources is matched, the aggregation system can aggregate the information into a single record in the contact data store. The aggregation system may use various techniques to match information of contact sources. The aggregation system may use the real-time identifier (e.g., SIP URI), electronic mail address, name, phone number, and so on. To reduce false positive matches, the aggregation system may match on various combinations of this information. The aggregation system may also attempt to resolve conflicts between information from different contact sources for the same contact. For example, the postal addresses of the different contact sources may be different because of a recent move. The aggregation system may assign a priority to the contact sources (e.g., set by designer or end user) and resolve the conflicts in favor of the contact source with the higher priority. The aggregation system may also keep the conflicting information (e.g., show multiple postal addresses). The aggregation system may also allow the user to choose between the conflicting information for a contact. In one embodiment, the aggregation system may use an existing contact source as the contact data store. For example, the aggregation system may aggregate contact information from different contact sources into an existing personal address book. In one embodiment, the aggregation system may collect and store all the information of a contact source. That information may include electronic mail addresses, phone numbers, postal addresses, job title, company, office, division, manager, web site address, and so on. Accordingly, the invention is not limited except as by the appended claims.

## Claims

1. A method in a computer system for synchronizing contact information of contacts, the method being performed by an application associated with a contact store that stores contact information of contacts collected from different contact sources, the method comprising:
collecting from the different contact sources contact information of contacts associated with a user;
for contacts for whom contact information was collected, storing in the contact store the contact information along with an indication of the contact sources from which the contact information was collected, each contact source having an associated application for updating contact information of the contact source;
for each of a plurality of contacts whose contact information was collected from different contact sources,
receiving from a user a request to update contact information of the contact;
identifying from the contact store the contact source from which the contact information of the contact was collected; and
requesting the application associated with the identified contact source to provide a user interface through which the user can update contact information of the contact that is stored in the identified contact source; and

for each contact source from which contact information was collected,
when the contact source supports providing update event notifications,
registering to receive update event notifications from the contact source for contact information of the contact source that has been updated; and
when an update event notification is received for the contact source, updating contact information of the contact store to reflect the update to contact information at the contact source;

when the contact source does not support providing update event notifications,
periodically polling the contact source to determine whether any contact information of the contact source has been updated; and
when the polling indicates that contact information has been updated, updating contact information of the contact store to reflect the update to contact information at the contact source


so that after contact information of a contact is updated at the contact source of the contact through the user interface provided by the application associated with the contact source, the contact information of the contact is updated at the contact store based on event notification received from the contact source or polling of the contact source.

2. The method of claim 1 wherein the contact information of a contact includes an identification, a telephone number, and a presence information address of the contact.

3. The method of claim 1 including, when requested by a user, adding a contact to a contact list.

4. The method of claim 3 wherein the adding of the contact to the contact lists includes notifying a contact list server that maintains the contact list.

5. The method of claim 3 wherein the contact list includes for contacts in the contact list an identification, a presence information address, and a contact source.

6. The method of claim 1 including receiving a search criterion from the user and searching the collected contact information of the contacts for contacts who satisfy the search criterion.

7. The method of claim 6 including displaying contact information of the contacts who match the search criterion in an order based on the contact sources of the contact information of the contacts.

8. The method of claim 7 wherein a contact identified from a personal contact source is ordered before a contact identified from a global contact source.

9. The method of claim 1 including collecting contact information from a contact list and subscribing to presence information of contacts in the contact list.

10. The method of claim 1 wherein contact information for a contact is displayed within the context of an application associated with the contact source from which contact information of the contact was collected.

11. A computer-readable storage medium containing instructions for controlling a computer system to synchronize contact information of contacts, by a method performed by an application associated with a contact store that stores contact information of contacts collected from different contact sources, the method comprising:
collecting from the different contact sources contact information of contacts associated with a user, each contact source having an associated application for updating contact information of the contact source;
for contacts for whom contact information was collected from a contact source, storing in the contact store the contact information along with an indication of the contact source;
receiving a request from a user to update contact information of a contact that is stored in the contact store;
requesting an application associated with the contact source to provide a user interface through which the user can update the contact information of the contact stored at the contact source of the contact as indicated by the contact store;
receiving updates to the collected contact information from the contact sources by
for each contact source from which contact information was collected,
when the contact source supports providing update event notifications,
registering to receive updates from the contact source for contact information of the contact source that has been updated; and
when an update event notification is received for the contact source, updating contact information of the contact store to reflect the update to contact information at the contact source; and

when contact source does not support providing update event notifications,
periodically polling the contact source to retrieve updates to the contact source; and
updating contact information of the content store to reflect the update to contact information at the contact source



so that the contact sources and the contact store have synchronized contact information by after the contact information of contacts can be updated through the user interfaces provided by the applications associated with the contact sources, the contact information of the contacts is updated at the contact store based on update event notifications received from the contact sources or polling of the contact sources.

12. The computer-readable medium of claim 11 wherein the contact list is maintained on a contact list server.

13. The computer-readable medium of claim 11 wherein the contact list includes for contacts in the contact list an identification, a presence information address, and a contact source.

14. The computer-readable medium of claim 11 including subscribing to presence information of contacts in the contact list.

15. The computer-readable medium of claim 11 including displaying contact information of the contacts who match a search criterion in and order based on the contact sources of the contact information of the contacts.