Abstract:
A mobile device is shown in the role of a centralized message transfer agent wherein it manages all messaging for a user for most if not all the time so as to provide a unified messaging approach across all messaging platforms. Other platforms are shown using the mobile device in this unified way. Related systems, methods, integrated circuits, and software are also shown.

Description:
CROSS-REFERENCE TO RELATED APPLICATION  
       [0001]     This application claims priority from U.S. Provisional Application Ser. No. 60/724,522 filed Oct. 6, 2005. 
     
    
     BACKGROUND OF THE INVENTION  
       [0002]     1. Technical Field  
         [0003]     The field of the invention relates to telecommunications and, more particularly, to messaging between users of a telecommunications system.  
         [0004]     2. Discussion of Related Art  
         [0005]     Phone calls, SMSs and e-mails are widely used for communicating. Most people use all of them regularly. These technologies are complementary but not coordinated.  
         [0006]     SMSs are particularly suitable for small-screen portable devices. For e-mail, the user interface and memory capacity of mobile phones and PDAs have somewhat limited usability as compared to a desktop or laptop PC due to their restricted size especially as concerns the larger screen and keyboard of a desktop or laptop computer. For simple convenience, some access of e-mail will typically be convenient and will be performed using the limited user interface of smart mobile phones. However, when required to perform longer tasks with e-mail many users tend to use the superior user interface and memory of desktop or laptop PCs as the primary access method for mobile e-mail. It has been projected that 80% of all access at mobile hotspots 2008 will still be through laptops, not mobile handsets. It is thus desirable to provide new features in mobile phones to improve the functionality of the phone when used in conjunction with a laptop or PDA.  
         [0007]     Some problems are that: 
    a) Current implementations of e-mail software on mobile phones allow for the download of e-mail headers or complete e-mails which can then be read, replied, etc. using the phone interface.     b) If the e-mails are downloaded to the phone for reading, responding, etc. they are either removed from the server or left on the server (user&#39;s choice).     c) If e-mails are removed from the server, the user cannot subsequently download them to a laptop or other device, then use the device with the better user interface to read, respond to, delete, etc. the e-mails.     d) If e-mails are left on the server, the laptop or other device must re-download the e-mails doubling the use of bandwidth, even though the e-mails may be available locally on the mobile phone.    
 
         [0012]     Even though one can use phone calls, SMSs and e-mails, people cannot handle these communication forms in a common way. As described above, phone calls and SMSs can be handled and archived on the phone, while e-mails can at the same time be handled and archived on a desktop or laptop PC with some user coordination required. Both the phone and the PC use their own set of contacts and the user needs to take care of synchronization. It is difficult (or even impossible) with prior art technology to reply to a phone call or SMS with Internet e-mail or vice versa. It would be useful to have a single communication center that would handle all the communication that the person is having, no matter what mechanism has been used for it. Furthermore, when the communication data is distributed (part of the data is stored in the phone and part in the computer) it is hard to search for all communication that has been conducted with a certain person.  
         [0013]     Users are not able to follow work-related electronic conversations if they are far from their own desk. Messages from different sources are not handled in a consistent manner and messaging clients have to be changed to communicate with different types of messages. It is not easy or sometimes even possible to answer a message using a different medium, e.g., to send notes written during a phone call and the recorded call as well to the caller in an email. When using a cell phone for certain types of cell phone related messages, the user would prefer to use a large screen and keyboard of any desktop computer nearby (pool computers, home computer, laptop, etc.) instead of the small size peripherals of the mobile terminal. Nonetheless the user would like to have access to the user&#39;s correspondence even if there is no desktop computer available. It is true though that the user would prefer to avoid use of existing  1  -to-I synchronization solutions because of the number of the visited locations and used computers.  
         [0014]     In the industry, there are plans to develop a communication history type of functionality. According to such plans, the idea is to provide an integrated contact management application but with a PC-centric approach. These plans include the eventual objective of enabling a PC user to connect Contacts to numerous portable devices (like cell phones) through a synchronization management infrastructure, to connect electronically with nearby contacts for peer-to-peer collaboration and file sharing, and to perform other duties which are either impossible today or require an extensive collection of third party software, much of which doesn&#39;t currently work together. A “Communication History” view is planned which will chronologically detail all of the phone, email, instant messaging (IM), peer-to-peer, or other conversations a person has had with contacts. Sorting by date, rating, message type, and other criteria is also contemplated. A mobility center that would act as an activity center for future mobile computers that will provide a handy front-end to touch all things needed by a mobile user. It appears that software tools are under development that are to be tied to PC operating systems.  
       BRIEF SUMMARY OF THE INVENTION  
       [0015]     An object of the present invention is to provide messaging in a way that is unified across platforms of differing types.  
         [0016]     Another object is to provide multi-messaging centered on a mobile device.  
         [0017]     Yet another object is to enable increased messaging usage in mobile devices.  
         [0018]     The present invention thus aims to solve the problem of users of today&#39;s messaging facilities: different types of messages require the usage of different hardware devices and several separate and non-interoperable software packages with different addressing schemes, while their ultimate raison d&#39;être is the same basic principle: to deliver a message to the addressee.  
         [0019]     The main idea of the present invention is to provide a mobile device in a new role, i.e., that of a centralized mail manager or message transfer agent. In that new role it can manage all messaging for most if not all the time. The user can have all his messages in the mobile device and other clients can connect to the mobile device to display/edit/send messages. Despite the user interface and memory limitations of today&#39;s portable devices described above, it appears that great strides are being made to improve both the user interface and the memory capacity of such devices. It can be foreseen that new functionalities will become possible.  
         [0020]     According to the present invention, a mobile-centric, multi-messaging type functionality is provided using currently existing standards and existing applications. Instead of using just one tool, the user is free to choose any email client application and use it on any platform. An embodiment comprises two main parts: an SMTP proxy and a POP/IMAP proxy server. Optionally an LDAP proxy server can be implemented to enhance addressing capabilities of the clients. Customization of the client side might be necessary to be able to fully use the offered functions.  
         [0021]     A mobile device such as a phone can publish its call log, MMS, SMS, email and other related data and functionality through standard protocols traditionally used for e-mail. Current phone models support POP3, IMAP, SMTP client protocols. However they do not support the server side of these protocols. Implementing mail server protocols on mobile devices such as cell phones can enable new kinds of applications. Existing e-mail clients can be configured to use these phone services.  
         [0022]     Such a client provides at least the following functionalities: (a) receiving and sending messages (SMS, MMS, email, instant messages), (b) log of incoming and outgoing calls and messages, (c) recordings of voice calls, (d) sending a pre-recorded voice message through e-mail, (e) IRC sessions, (f) phonebook, and (g) calendar.  
         [0023]     Using these via an email client would allow several benefits to the user: (a) User&#39;s “all communications” history is made available in a single device using multiple existing protocols, (b) Email client may offer increased usability e.g. full qwerty keyboard and 17” screen for reading and writing messages, (c) The search tools e.g. finding email or Google desktop search can find all communications including phone calls, (d) Using different media for mixed communication gets easier, e.g., answering a phone call with an email message, and (e) Storing and backing up all communications history is possible.  
         [0024]     An open approach using standard protocols encourages innovation by the community of email clients built on top of the inventive functionality. The solution preferably uses existing standard protocols in order to be able to connect to the existing communications networks. Different characteristics of the different protocols used when sending messages should be well hidden from the user.  
         [0025]     In one use case the user would use the push email solutions to get the email messages to his phone. The user could look at the titles immediately and using the mobile device evaluate the most urgent or small issues on the road. Later in the office, in some public hotspot e.g. hotel&#39;s business center, or using his own laptop in the hotel room the user would use the email client in the computer to read those email messages that are long, contain attachments that are hard to use on phone, or that require access to users own data. The last step is enabled by the innovation.  
         [0026]     Another possibility is that users are able to send email to each other using a proximity network. E.g. two roaming colleagues could avoid the slow and potentially expensive emailing via a faraway company server.  
         [0027]     This would also reduce the need for different transfer mechanisms. Everything would be email and all the application could take advantage of the email platform.  
         [0028]     The messages could be routed in the most optimal way: via phone over cellular, via a computer connected to the fixed internet, or via a proximity network.  
         [0029]     In an emerging market scenario with limited fixed connections a group of people could share a single phone for their email communications. Each user could have his own computer that would need to have a connection only to the phone email server.  
         [0030]     According further to the present invention: (a) Email messages can be downloaded only once and only to mobile phones. When user (and his/her phone) is nearby his/her PC/laptop email client on PC would access the emails from the phone via fast proximity connections, (b) Email client on PC can be setup to work only as a thin client and messages are stored on mobile device, which is always with the user, (c) User would be able to use any standard email client on PC/laptop, (d) When mobile device is nearby, PC/laptop user can use PC&#39;s or laptop&#39;s display and standard keyboard to view/edit cellular messages (SMS, MMS), (e) Email client could be used to view phone call logs and related notes, (f) Only one application (email client) is used for different kind of communications, (g) User experiences seamless integration, (h) There is no need to maintain several contact lists.  
         [0031]     A system implementing the invention provides access to phone calls/SMS and e-mails in a uniform way.  
         [0032]     Using standard protocols the invention provides the following advantages: (a) The phone&#39;s services can be accessed on any PC supporting these email server protocols regardless of hardware platform and operating system, (b) The phone&#39;s services can be accessed from any e-mail client, leaving the user the choice of his/her preferred application instead of learning a new one, (c) The user needs only one phonebook and can carry this phonebook with the phone to the workplace, home, public internet places (library, internet coffee) and use a fresh and well-maintained contact list for e-mailing, (d) Easy to reply for messages (SMS, MMS) in less expensive e-mail.  
         [0033]     The benefits of getting all types of messages such as calls, SMSs, and emails in a mobile-centric way are very significant because of the always-with-you, always-on feature that such devices are capable of and which is not true for the PC. Reading and writing of messages can be done on the desktop/laptop when convenient.  
         [0034]     On the other hand, in a slightly different and less mobile-centric solution, the invention could simply add a new functionality to mobile devices that would allow the device to both act as a client and server in an e-mail system. As a client, the device can download e-mails from the original server for reading, responding, deletion, etc. on the mobile device. The mobile device might use GPRS, Edge, EVDV, EVDO, WiFi, WiMax, WCDMA, or other networks to connect to the primary server. The device subsequently acts as a server to another device such as a laptop or PDA and use a local connection method such as a cable, IrDA, Bluetooth, WiFi, etc. to transfer the previously downloaded e-mails to the other device. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0035]      FIG. 1  shows a prior art email client within a phone structure interfaced to external devices.  
         [0036]      FIG. 2  shows an implementation of the present invention using proxies within a phone structure similar to that of  FIG. 1 .  
         [0037]      FIG. 3  shows an implementation of the present invention using full-featured servers instead of the proxies of  FIG. 2 .  
         [0038]      FIG. 4  shows main use cases, according to the present invention.  
         [0039]      FIG. 5  shows a graphical user interface (GUI) command description, according to the present invention.  
         [0040]      FIG. 6  shows a state machine of the GUI of  FIG. 5   
         [0041]      FIG. 7  shows a signal processor that may be used, according to the present invention. 
     
    
     DETAILED DESCRIPTION OF INVENTION  
       [0000]     Abbreviations  
         [0042]     ISP: Internet Service Provider  
         [0043]     SMS: Short Message Service  
         [0044]     MMS: Multimedia Messaging Service  
         [0045]     MTM: Message Type Module  
         [0046]     WLAN: Wireless Local Area Network  
         [0047]     SMTP: Simple Mail Transfer Protocol (RFC 821)  
         [0048]     POP3: Post Office Protocol 3 (RFC 1939)  
         [0049]     IMAP: Internet Message Access Protocol (RFC 1730, RFC 2060)  
         [0050]     LDAP: Lightweight Directory Access Protocol (RFC 1777)  
         [0051]     RFC: Request for Comments  
         [0052]      FIG. 1  shows a prior art cell phone structure interfaced to external devices. Although the prior art includes such a device with the illustrated structure it should be realized the embodiments of the invention to be disclosed in  FIGS. 2 &amp; 3  are merely examples and are not restricted to a cell phone but are generally applicable to any mobile communication device. Moreover, the invention is not restricted to a mobile communication device, as will become apparent by the description which follows. On the left-hand side of  FIG. 1  is a mobile communication device e.g., having a cell phone structure and having a mobile messaging client, e.g., an email client able to send and receive email to and from the external SMTP and POP/IMAP devices illustrated on the right-hand side of the Figure. The entity on the right-hand side labelled ‘External’ does not necessarily stand for a single physical unit. Instead, it should be thought of as e.g. one computer that runs the POP/IMAP server, another hosting the SMTP server and a third one where a mail drop is available for use, plus the connecting network. In other words, ‘External’ can be taken as the abstraction of the whole Internet. Although not shown, it should also be understood, without being limited thereto, as embracing all the possible radio interfaces for mobile communication devices with all the functionalities that implies. These would include GSM, 3GPP, CDMA, WCDMA, OFDM, Super 3G, 3.9G, LTD, EDGE, GPRS, 4G, WiMAX, UWB, WiFi, EVDV, EVDO, Bluetoooth, IRDA, etc., without limitation. The many possible ways of temporary or permanent hardwired connection existing between mobile communication devices and desktop or laptop PCs such as Ethernet, USB, Firewire, etc., are also embraced.  
         [0053]     Directional data flows are shown by heavy lines, each flow labelled with a capital “D” and a number. A control signal associated with each data flow is labelled “C” with the same number and is shown as a dotted line. A given control signal may have a direction the same as or opposite that of its associated data flow, as shown.  
         [0054]     For a prior art email message sent from an email client of the cell phone on the left hand side of  FIG. 1  to the external devices on the right-hand side, a data flow D 1  from the email client of the phone terminates at a “Send-As” server within the phone under the control of a signal C 1  from the email client to the Send-As server. The Send-As server is a simplified generic interface, e.g., to the various Symbian Message Type Modules (MTMs) that can be used to send different types of messages quickly, without paying much attention to the details of different message types. It is a built-in component of the Symbian system. The “Send-As” server provides a data flow D 2  to a Server Message Type Module (MTM) within the phone under the control of a control signal C 2  from the “Send-As” Server to the Server MTM. The term Server MTM is used as a short common name for the above-mentioned various MTMs that are able to accept data from the user and transfer that data to another location. The Server MTM provides a data flow D 3  to an SMTP Server external to the phone under the control of a control signal C 3  from the Server MTM to the external SMTP Server. The external SMTP Server provides the email message on a data line D 4  to a mail drop, i.e., to a storage device external to the phone. The intended recipient will then be able to obtain the stored email message using a POP/IMAP Server, whether it be the POP/IMAP Server shown or some other similar POP/IMAP server. It should be realized that embodiments of the invention are not limited to a mobile communication device or to a device having a “Send-As” server connected to a Server MTM.  
         [0055]     Also shown within the phone on the left hand side of  FIG. 1  are a Symbian Message Server and a Client MTM. An email message is retrieved from the external POP/IMAP Server as a data flow D 6  under the control of a control signal on a line C 6 . The Client MTM sends the message on a data flow line D 7  to the Symbian Message Server under the control of a control signal on a line C 7  from the Symbian message serve to the Client MTM. The Symbian Message Server in turn sends the email message as a data flow D 8  to the email client within the phone under the control of a control signal on a line C 8  from the email client to the Symbian Message Server. The invention is not limited, however, to a mobile communication device having a Symbian Message Server and a Client MTM.  
         [0056]     The prior art cell phone of  FIG. 1  is able to send and retrieve email and it can also be used in other types of communications such as SMS and MMS. But while away from the office or home PC, or even while in the office or at home, the user is not easily able or is even unable to coordinate between the messages sent and received while mobile using the mobile device and the messages sent and received using a PC while in the office or at home. In the present environment, the user will likely be encouraged by the PC operating system proprietor to use an integrated contact management application, a Mobility Center and a “Communication History” to in effect view the PC as a messaging hub. As explained above, a major difficulty with this approach is the need for a single tool under the control of a single proprietor.  
         [0057]     In keeping with the above prior art background, contrary to the above described PC operating system plans under development, the present invention teaches an inventive unified messaging using for instance Symbian terminals as primary message stores/forwarders (servers) and desktop/phone clients as message producers/consumers (clients). Besides showing functions, the following description of several embodiments also shows high-level implementation details and connections. The teachings hereof can usefully be employed by a software developer team, the technical staff of a customer, etc.  
         [0058]      FIGS. 2 and 3  show two separate embodiments of the present invention implemented on a mobile communication device, in this case a cell phone, providing centralized messaging using a message transfer agent according to for instance the following existing protocols: SMTP, POP3, IMAP, and LDAP. These protocols use TCP/IP networking so in such a case a PC must have a TCP/IP connection to the phone. The TCP/IP connection can be established using: (a) wireless technology (e.g., Bluetooth, WLAN, IRDA, or the like), (b) wired connection (e.g., USB or the like), (c) or some other appropriate wireless technology. The assignee hereof has on-going activities to have easy phone-PC connection with such various wireless technologies. The integration of these different messaging protocols and technologies for simplified location-semi-independent single-client access will be described for the embodiments which follow.  
         [0059]     The SMTP proxy server of  FIG. 2  may implement the basic SMTP protocol described in RFC 2821 and the POP/IMAP proxy server may implement RFC 1939 and RFC 3501 for POP and IMAP protocols. The LDAP proxy server may implement RFC 3377. To enhance portability, the servers may be source-compatible with Symbian V7.0s and later. The GUI will have to be ported if the target is not 80.  
       Embodiment 1  
       [0060]     In this embodiment the primary email handler is the phone&#39;s built-in email subsystem. The additional servers running on the phone serve as a bridge between external clients and the phone message handler infrastructure: they accept connections from other clients but the data they transfer is injected into and retrieved from existing message processing facilities. In this case, the phone software collects messages from different POP/IMAP servers on demand, stores them on the phone and passes them to connecting email clients for manipulation (read/reply/delete/etc.).  
         [0061]     A simplified schema can be seen in  FIG. 2 . An SMTP Server Proxy and a POP/IMAP Server Proxy have been added to the prior art structure of  FIG. 1 , according to the present invention, as message transfer agents. They process messages from an external messaging client installed on a communication device of the user of the inventive mobile communication device. An optional LDAP server may also be added, as shown for interacting with a new or existing Contact list function. All the added servers function as bridges between external clients and the prior art messaging components such as the prior art Symbian messaging components within the illustrated mobile device or phone.  
         [0062]     The communications interfaces are shown in  FIG. 2 . Each interface is presented as one control and one data flow marker. That is, Interface p[p=1, 2, 3. . . ] =I p =(C p , D p ). The control arrow points from controller to controlled and the data arrows point from source to sink. The new interfaces I 9 , I 10 , I 11 , I 12 , I 13  and I 14  are added by this invention, and the others are existing Symbian interfaces as described above in connection with  FIG. 1 .  
         [0063]     The SMTP Server Proxy is the outgoing connection for the external devices such as a desktop email client as shown. The SMTP Server Proxy performs a server process that runs on the mobile phone or terminal. This proxy is responsible for transmission and local delivery of the messages generated by the client software. The  19  interface uses TCP sockets and SMTP protocol (see RFC 2821). The external desktop client on the left hand side of  FIG. 2  connects using the SMTP protocol using a control signal C 9  and sends MIME (Multipurpose Internet Mail Extensions) formatted rich messages on a data flow line D 9  that are parsed by the SMTP Server Proxy and passed on a data flow line D 10  to the corresponding Symbian messaging “Send-As” server component under the control of a control signal on a line C 10 . The SMTP Server Proxy connects to the Symbian Send-As server as a client using Symbian client-server architecture. The communication uses the Symbian messaging API. Since the messages are stored in a Symbian-specific format in the device, they have to be converted between device-internal and MIME formats before being sent on a data flow line D 2  to a Server MTM under the control of a control signal on a line C 2 . From the Server MTM the messages are sent on a data flow line D 3  to an external SMTP Relay under the control of a control signal on a line C 3 . The “Send-A” Server or the Server MTM may perform the conversion to MIME format. The external Email Client shown in  FIG. 2  on the right hand side using the SMTP Server Proxy in the mobile communication device on the left hand side could reside in any kind of communication device besides a desktop such as a laptop, a PDA, another kind of mobile communication device, etc.  
         [0064]     The external (e.g., desktop) email client can connect to the POP/IMAP Server Proxy using TCP sockets and POP (RFC1939) and/or IMAP (RFC3501) protocols. Of course, it will be realized that the email client resides within an apparatus and that there is necessarily a device connected within that apparatus connected to the email client and that is connectable to the mobile communication device of the user. The POP or IMAP Proxy Server (or both) is a server process that runs on the mobile terminal. It is responsible for serving delivered and stored messages to the clients when they ask for them. A control signal is shown on a line C 12  from the external email client to the POP/IMAP Server Proxy. The POP/MAP Server Proxy sends a control signal on a line C 11  to the Symbian Message Server within the phone device. According to this embodiment of the present invention, the control signal on the line C 7  can be used also to get email from the external POP/IMAP Server via the Client MTM to be sent via the POP/IMAP Server Proxy to the external Email Client. The control signal on the line C 6  requests this email and it is sent to the Symbian Message Server via the Client MTM over data flow lines D 6  and D 7  and from there to the external email client via the POP/IMAP Server Proxy over the data flow lines D 11  and D 12 . The POP/IMAP Server Proxy connects to the Symbian messaging services as a client using Symbian client-server architecture. The communication uses the Symbian messaging API. One or more messages are sent from the Symbian Message Server on the data flow line D 11  to the POP/SAP Server Proxy. Since the messages are stored in a Symbian-specific format in the phone device, they have to be converted between device-internal and MIME format before being sent on a data flow line D 12  to the connected external client (see RFC2045, RFC2046, RFC2047, RFC2048 and RFC2049). The POP/IMAP Server Proxy may be used to perform this conversion.  
         [0065]     In the case of an IMAP Server Proxy, some items shown in a client of the phone&#39;s mailbox folders are non-email messages (like SMS/MMS) or are not even messages by their original nature (contacts, calendar entries, tasks for example). These items are converted to textual format as well. An example would be accessing the call log of the mobile device and sending an answer. An external (e.g., desktop) client requests the content of a call log item presented to the client as a special text message. The IMAP Server Proxy fetches a call log item from the messaging system. The given log entry is converted to a text format, e.g., an email item with special X-header fields that identify the item as a call log entry. The converted entry is sent to the desktop email client on the line D 12  and it can be displayed using a special format. Replying this generated mail item may result in initiating a new call on the phone or sending a textual message (email/SMS/MMS) to the originating device. If a message is sent, it is passed to the SMTP proxy on the phone on the line D 9 .  
         [0066]     Regarding the  113  interface between the external (e.g., desktop) email client and the LDAP server proxy, the email client can communicate with the LDAP Server Proxy through TCP sockets using the LDAP protocol described in RFC3377.  
       Embodiment 2  
       [0067]     This embodiment provides a full email server implementation. Both the internal clients in the phone and the external clients use the standalone servers running in the phone. A schema for this embodiment is shown in  FIG. 3 . Notice that the POP/IMAP Server Proxy of  FIG. 2  has been replaced by a standalone POP/IMAP Server. Likewise, the SMTP Proxy Server of  FIG. 2  has been replaced by a standalone SMTP Server. In this case, a user can tell his internet service provider such as xDSL, Cable, or Satellite provider to send his email to the POP/IN4AP server of the mobile phone and the user then gets his email routed through to the mobile automatically, without having to take positive action to collect messages from different POP/IMAP servers on demand. In other words, as between the basically two ways of getting information—push or pull—this solution uses a “push” approach. In the first embodiment, as applied to the “pull” solution of  FIG. 2 , it means that the portable device has to go to the external POP/IMAP site and ask for information. Thus, the cell phone has to “pull” the information from the server by doing something. “Pushing” on the other hand involves the server sending the mobile device information of a general type previously prearranged to be sent. For instance, the mobile device can inform one or more servers that it is on line and ready to receive whenever they are ready to send. Or, the servers can monitor the mobile device to find out when it is available and send anything that is already ready to be sent or that becomes available during the time that the mobile device is determined to be available. The “push” can be active or directed. In an active push the server interacts with the mobile device by sending all the content to the mobile device upon the client&#39;s request such as in embodiment  1 . In a directed push the server interacts with the mobile device only occasionally.  
         [0068]     Notice that the mobile communication device on the left in  FIG. 3  includes, in this embodiment, a mail drop, i.e., a mass storage device capable of storing messages in such a way as to enable the mobile communication device on the left hand side of  FIG. 3  to become the center of the user&#39;s messaging experience. Such a device could be a hard drive, a flash memory, etc. Instead of having a rather confusing messaging experience as in the prior art as explained previously, the user now has the capability to use his mobile communication device in a unified, centralized manner with respect to messaging. Since the mobile communication device is presumably always with the user, it is in the best position to fulfill such a role, which is a completely new and powerful way of enabling the modem user of mobile communication devices to operate in the messaging environment and to thereby to make the user&#39;s messaging experience more efficient and effective across all kinds of different messaging, not just email. As explained in the previous paragraph, the mobile communication device on the left hand side of  FIG. 3  may receive email pushed from an external mail server such as might reside in the user&#39;s ISP. The email client within the mobile communication device on the left can initiate the retrieval of such messages by sending a control signal on the line C 8  to the Symbian Message Server which in turn sends a control signal on the control line C 7  to the client MTM. The client MTM sends a control signal on a line C 6  to the POP/IMAP server which has already retrieved or retrieves at that time any incoming messages intended for the user or client. The messages are provided on a data line D 6  to the client MTM which in turn transfers the retrieved messages on the data line D 7  to the Symbian Message Server which in turn provides the retrieved messages on the line D 8  to the email client within the phone for access by the user using a user interface of the phone. Similarly, the email client of the phone may send a message by initiating a message transfer on a data line D 1  to the Send-As server under the control of a control signal on a line Cl from the email client to the Send-As server. The Send-As server sends the outgoing message on the data line D 2  to the server MTM under the control of a control signal on a line C 2  from the Send-As server to the server MTM. The server MTM sends the outgoing message on the line D 3  to the SMPTP server within the phone under the control of a control signal on the line C 3 . Depending on the nature of the message, it could be sent on a data line D 15  to an external SMTP server shown on the right hand side of  FIG. 3  under the control of a control signal on a line C  15 . Or, it could be sent internally from the SMTP server on a data line D 4  to the mail drop for pickup by the POP/IMAP server over a data line D 5  either at that time or subsequently on demand from an external email client (also belonging to the user but resident on another terminal device) using a control signal on a line C  12  to cause the message to be sent from the POP/IMAP server on a data line D 12  to the external email client. Notice that the external client may also retrieve messages residing in the mail drop that have come from the ISP of the user or that have come to reside in the mail drop from other sources that are not shown in  FIG. 3 . In such cases, the external email client may send a control signal on the line C 12  to the POP/IMAP server which in turn retrieves the desired messages of the user from the mail drop on the data line D 5  and sends them onward to the external email client on the data line D 12 . In this way, another communication device of the user that is external to the mobile communication device on the left of  FIG. 3  can participate in the messaging experience of the user but still using the mobile communication device on the left as the central entity in the entire now completely centralized messaging experience of the user.  
         [0069]     Use of the embodiments of  FIGS. 2 and 3  will solve the problems of users of today&#39;s messaging facilities: different types of messages require the usage of different hardware devices and several separate and non-interoperable software packages with different addressing schemes, despite their ultimate raison d&#39;être being the same i.e., to deliver a message to the addressee. As outlined above, the present invention comprises adding a message transfer agent to the prior art mobile communications device and the added agent can take the form of for example, an SMTP server, an SMTP proxy and/or a POP/IMAP server or proxy. An LDAP proxy can be implemented to enhance addressing capabilities of the clients. Customization of the client side might be necessary to be able to fully use the offered functions. Use cases are summarized in  FIG. 4 . The use case descriptions use numbering and lettering for paragraphs. Numbering always implies strict ordering of the same-level items; lettering does not impose any restrictions on execution order.  
         [0070]     It should be appreciated that the present invention can be carried out in the form of a computer program stored on a computer readable medium having programming code stored thereon for causing a mobile communication device such as the phone of a user on the left hand side of  FIG. 2  or  3  within which the medium is installed or is installable to act as a central message transfer agent for processing messages of the user to and from an email client also resident on the mobile communication device and also to and from one or more messaging clients installed in corresponding terminal devices used by the user that are external to the mobile communication device of the user. Similarly, an integrated circuit could be used instead of a computer program in the same way.  
         [0071]     Although sometimes used in the art to refer only to an SMTP server, it should be understood that the term “message transfer agent” is used herein in the more generic sense of comprising one or more of the LDAP server, POP/IMAP server proxy, or SMPTP server proxy of  FIG. 2 . Similarly, the term is used to cover one or more of the LDAP server, POP/IMAP server, mail drop, or SMTP server of  FIG. 3 . It can also be understood as including one or more of the devices shown in the phone on the left hand side of  FIG. 1  including the Send-As server, the server MTM, the Symbian Message Server, or the client MTM. It will be appreciated that all of these devices will normally be carried out as software entities embodied in programming code or their hardware equivalents. It is also possible to use a general purpose signal processor such as shown in  FIG. 7  including typical components found in such general purpose devices such as a clock, a random access memory, a read only memory, an input/output device, and various other devices all interconnected by data, address, and control lines.  
         [0072]     Regarding the external devices of the user, such can be viewed as communication terminals of that user, each comprising an email client, and a communication device connected to an email client and connectable to the mobile communication device of the user, for instance shown on the left hand side of  FIGS. 2 and 3 . The signal processor of  FIG. 7  could be used and the input/output device therein would serve as the above-mentioned communication device while the email client would be embodied in executable code. The mobile communication device on the left hand side comprises a messaging client for originating and terminating messages from and to the user of the mobile communication device and a message transfer agent for processing messages including messages communicated between any external terminal of the user and the mobile communication device. Such messages can include messages originated or intended for the user and which are communicated between the mobile communication device of the user which is acting in a central messaging role and other terminal devices of the user.  
         [0073]      FIG. 4  shows some non-limiting main use cases, according to the present invention. Targeted users are users in general but could be members of a company for instance who are likely to move among different locations spending relatively long periods of time at each place during their normal everyday work experience. They may be trained to use traditional desktop messaging client software.  
         [0000]     Office Use Cases:  
         [0000]     1. Prologue  
         [0074]     1. The mobile device is a member of a wireless mail-capable network all the time.  
         [0075]     2. The user comes to his desk at the office and puts his device on the table.  
         [0076]     3. The office communication infrastructure detects the presence of the device and establishes a peer-to-peer connection. (WLAN, Bluetooth, IRDA, etc.)  
         [0077]     4. The messaging client of the desktop PC is notified by the communications infrastructure about the presence of the mobile device.  
         [0078]     The desktop PC messaging client connects to the mobile device and starts using it as messaging gateway.  
         [0000]     2. Message Handling  
         [0000]     A. Receiving and sending email/SMS/MMS  
         [0079]     a) Upon arrival of a new message, the POP/IMAP proxy assuming e.g. the phone of  FIG. 2  is notified by a Symbian message server. The proxy keeps track of the status of these messages.  
         [0080]     b) When connected email client fetches a mail item, the remembered items are transferred by the POP/IMAP proxy (and converted to email format on the fly in case of non-emails items, like SMS, MMS, etc.) directly from the Symbian message store tree.  
         [0081]     c) The connected email client sends an email item to the SMTP proxy. Based on the destination address and possible transport preference markers, the message is converted to the required format and is passed to the Symbian “Send-as” server for further processing.  
         [0082]     Note: Reply to an item can use different service, e.g.: reply to an email can be sent as SMS, reply to a missed call can be sent as email and/or SMS/MMS, etc.  
         [0000]     B. Manipulate call history  
         [0083]     1. The user receives a phone call.  
         [0084]     2. A new call history item is available as a new empty message/note/task/calendar item addressed to the caller.  
         [0085]     3. The user takes some notes using the desktop client while speaking.  
         [0086]     4. When the call is over the message is updated to show call duration.  
         [0087]     5. The updated message can be sent to the addressee as message/note/task/calendar item or saved for future reference.  
         [0000]     C. Manipulate Contacts  
         [0088]     A. Addressing 
        1. The user creates a new message of the desktop client.     2. Destination address popup shows names for the phone contact list.     3. Message type dependent address details are fetched from the phone an are inserted into the message.        
 
         [0092]     B. Manage contacts 
        1. The user creates or edits a contact database item on either the desktop client or the phone. Whichever device is used, the data is stored on the phone contact list and is available for addressing on both devices (internally on the phone, via LDAP on the desktop client).        
 
         [0094]     The changes are visible on the other device as soon as the edited items is saved.  
         [0000]     3. Epilogue  
         [0095]     1. Upon leaving the company network the mobile device switches to e.g. VPN and all messaging functions are still available on the device without using expensive cellular services.  
         [0096]     The cellular/non-cellular connection type preferences should be based on cost calculations.  
         [0097]     2. The desktop PC messaging client switches back to the company internal messaging network (if the PC is a shared device) or just suspends its operation (in case it is a dedicated personal computer).  
         [0098]     Referring now to  FIG. 5 , a graphical user interface (GUI) command description is shown to describe a state machine shown in  FIG. 6 . The servers or server proxies shown in  FIG. 2  and  FIG. 3  optionally can have a simple GUI for starting, stopping, tracing and in general using the servers. When the GUI is connected to a running server, “debug” messages can be seen in a text editor as a read-only document. The states and valid commands are listed in the table of  FIG. 5  and should be understood in conjunction with the state machine of  FIG. 6 . The GUI should connect to the servers using for instance a standard Symbian socket API. The servers may send diagnostic output to the opened socket. Any data sent to the server on the same socket may be implemented as a termination request. Server diagnostic messages may be written into a server log file and sent to the connected clients. As for speed, mobile operating systems such as Symbian widely use-threaded cooperative multitasking in client-server implementations. Consequently, actions or requests must be short execution sequences to avoid excess blocking of the active scheduler. Longer operations must be broken up into smaller chunks. If this is not feasible, they have to be performed in a separate thread. Since mobile terminals have relatively small amounts of memory, the server proxies must not keep local copies of the messages any longer than it is necessary to pass them to the next entity in the chain.  
         [0099]     On the other hand, another less mobile-centric implementation would simply add software that resides on a mobile device that performs the following functions: 
    (a) downloads e-mails from server to handset;     (b) provides a user interface so user can read and respond to e-mails on the handset;     (c) maintains copies of downloaded and sent e-mails;     (d) provides communications interface via Bluetooth, IRDA, WiFi, UWB, or other media to a secondary device;     (e) acts as a local e-mail server for the secondary device such as laptop or PDA—retrieved e-mails are deleted, acts as intermediary to send outgoing e-mails;     (f) acts as a conduit to allow the download to the secondary device of any previously un-downloaded or new messages;     (g) provides a user interface that allows a user to easily determine whether e-mails have been received/sent.    
 
         [0107]     Such an implementation has the advantage of decreasing the total transfer time for e-mails when a mobile phone is used in conjunction with a laptop. The mobile phone is always on and receiving e-mails as they are pushed to the phone. A laptop or PDA is usually kept off when mobile, but the invention allows the e-mails to already be downloaded and available to the secondary device when the laptop is booted.  
         [0108]     Although the invention has been shown and described with respect to specific embodiments, thereof, it should be realized that many other embodiments are possible within the scope of the appended claims.  
       REFERENCES  
       [0000]    
       
          [RFC2821] Simple Mail Transfer Protocol  
          [RFC1939] Post Office Protocol—Version 3  
          [RFC3501] IMAP—Version 4revl  
          [RFC3377] Lightweight Directory Access Protocol (v3): Technical Specification  
          [RFC2045] Multipurpose Internet Mail Extensions (MIME) Part One:  
       
     
         [0114]     Format of Internet Message Bodies 
    [RFC2046] Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types     [RFC2047] MIME (Multipurpose Internet Mail Extensions) Part Three:    
 
         [0117]     Message Header Extensions for Non-ASCII Text 
    [RFC2048] Multipurpose Internet Mail Extensions (MIME) Part Four:    
 
         [0119]     Registration Procedures 
    [RFC2049] Multipurpose Internet Mail Extensions (MIME) Part Five:    
 
         [0121]     Conformance Criteria and Examples