the invention will be illustrated below in conjunction with an exemplary communication system . the invention is not limited to use with any particular type of communication system switch , server , or configuration of system elements . those skilled in the art will recognize that the disclosed techniques may be used in any communication application in which it is desirable to provide improved contact processing . fig1 shows an illustrative embodiment of the present invention . the communication system 100 includes an enterprise network 104 , internet service provider ( isp ) 108 and associated message database 112 , and external communication devices 116 and 120 , interconnected by a packet - switched and circuit - switched networks 124 and 128 . the enterprise network 104 in turn includes a gateway 132 , a server 136 , a message server 144 and associated message database 148 , text - to - speech engine 152 , and first , second , . . . nth packet - switched communication devices 156 a - n interconnected by local area network ( lan ) 160 , and a switch 140 connected to first , second , . . . mth circuit - switched communication devices 164 a - m . the packet - switched network 124 is a distributed processing network , such as the internet , and the circuit - switched network 128 is typically the public switched telephone network ( pstn ). the internet service provider or isp 108 is a vendor providing access for customers to the packet - switched network 124 . the isp 108 can provide a core group of internet utilities and services , such as email , news group readers , weather reports , restaurant reviews , and the like . the user typically reaches the isp 108 by either dialing - up with his communication device ( e . g ., computer ), modem , and phone line or over a dedicated line installed by a telephone company . the associated database 112 includes isp customer information and customers &# 39 ; email mailboxes . the gateway 132 is a conventional electronic signal repeater that intercepts and steers electronic signals from one network to another . the server 136 and switch 140 can be separate as shown or integrated . the term “ switch ” or “ server ” as used herein should be understood to include a pbx , an acd , an enterprise switch , or other type of communications system switch or server , as well as other types of processor - based communication control devices such as media servers , computers , adjuncts , etc . the server 136 and / or switch 140 can be any architecture for directing contacts to one or more communication devices . illustratively , the switch and / or server can be a modified form of the subscriber - premises equipment disclosed in u . s . pat . nos . 6 , 192 , 122 ; 6 , 173 , 053 ; 6 , 163 , 607 ; 5 , 982 , 873 ; 5 , 905 , 793 ; 5 , 828 , 747 ; and 5 , 206 , 903 , all of which are incorporated herein by this reference ; avaya inc .&# 39 ; s definity ™ private - branch exchange ( pbx )- based acd system ; multivantage ™ pbx , crm central 2000 server ™, communication manager ™, s8300 ™ media server , and / or avaya interaction center ™. typically , the switch / server is a stored - program - controlled system that conventionally includes interfaces to external communication links , a communications switching fabric , service circuits ( e . g ., tone generators , announcement circuits , etc . ), memory for storing control programs and data , and a processor ( i . e ., a computer ) for executing the stored control programs to control the interfaces and the fabric and to provide automatic contact - distribution functionality . the switch and / or server typically include a network interface card ( not shown ) to provide services to the serviced communication devices . other types of known switches and servers are well known in the art and therefore not described in detail herein . the message server 144 is an application server that provides one or more messaging services . the messaging server 144 , for example , can be a voice mail server , an email server , an instant messaging server , a text chat server , and the like . depending on the type of messaging server 144 , the message database 148 includes subscriber mailboxes , stored messages , subscriber associated addressee lists ( e . g ., contact lists , buddy lists , telephone directories , and the like ), subscriber authentication information , and the like . the tts conversion engine 152 converts text into corresponding speech and is conventional . the internal first , second , . . . nth communication devices 156 a - n and external communication device 116 are packet - switched and can include , for example , ip hardphones such as the avaya inc .&# 39 ; s , 4600 series ip phones ™, ip softphones such as avaya inc .&# 39 ; s , ip softphone ™, personal digital assistants or pdas , personal computers or pcs , laptops , packet - based h . 320 video phones and conferencing units , packet - based voice messaging and response units , packet - based traditional computer telephony adjuncts , and any other communication device . the internal first , second , . . . mth communication devices 164 a - m and external communication device 120 are time division multiplexed and / or circuit - switched . each of the communication devices 164 a - m and / or 156 a - n correspond to one of a set of internal extensions . these extensions are referred to herein as “ internal ” in that they are extensions within the premises that are directly serviced by the switch and / server while “ external ” communication devices 116 and 120 are not within the premises that are directly serviced by the switch and / or server . more particularly , these extensions correspond to conventional communication device endpoints serviced by the switch / server , and the switch / server can direct incoming calls to and receive outgoing calls from these extensions in a conventional manner . the second communication devices can include , for example , wired and wireless telephones , pdas , h . 320 video phones and conferencing units , voice messaging and response units , traditional computer telephony adjuncts , and any other communication device . it should be noted that the invention does not require any particular type of information transport medium between switch or server and first and second communication devices , i . e ., the invention may be implemented with any desired type of transport medium as well as combinations of different types of transport channels . included in one or more of the isp 108 , external communication devices 116 and / or 120 , server 136 , message server 144 , and / or communication devices 164 is an addressee analysis module 168 . the module 168 provides a modified type of autocomplete functionality for inputted addressee identifiers . as will be appreciated , the addressee identifier can be any unique identifier of an addressee , such as an email address , telephone number , ip address , name , and the like . the module 168 , for each user or subscriber , monitors the addressee identifiers used in messages , for more frequently used addressee identifier groups creates , with or without user or subscriber input , groups of identifiers , and , when the user or subscriber is entering an identifier , provides a list of likely ( matching ) single identifiers , distribution list names , and automatically generated identifier groups . the module 168 may be in a number of locations , including in an isp 108 , a packet - switched or circuit - switched communication device 116 and 120 , respectively , the server 136 , the switch 140 , the first , second , . . . mth internal communication devices 164 a - m , the message server 144 , and / or the first , second , . . . nth communication devices 156 a - n . referring to fig2 and 3 , the graphical user display presented by the module 168 to the user will be described . the figures show that the module monitors the set of addressee identifiers that the user sends messages to , derives a set of commonly messaged groups , stores the commonly messaged groups internally , and , whenever the user starts to type in letters that are contained in the identifier of an addressee , displays as a separate option not only the corresponding identifier of the individual but also any of the commonly used groups of which the identifier is a member . for example , in fig2 the user has typed in “ l - e - n ” in the “ to ” addressee field 200 . a matching identifier is “ lenard , rohan ” and would be displayed in the drop down list 204 as a first entry 208 . in addition , rohan lenard is a member of a frequently used group containing not only the identifier rohan lenard but also the identifiers sunny singh kalsi and richard j . atkins as a second entry 212 in the drop down list 204 . although the group match can be a simple string analysis , it is preferably a semantic analysis that matches against any member of the group . in other words , the group would be listed not only if the first member of the group matched but also when the first member is not a match but a later member is . thus , if the user were to type “ a - t - k ”, the user would see in the drop down list : the module will thus recommend frequently messaged lists of individuals alongside individual matches . this is illustrated in fig2 in which the first name is the first name in the drop down list 204 . in contrast , fig3 shows the same frequently used group in a drop down list 300 when a different identifier in the group is entered in the addressee field 304 . specifically , “ k - a - l ” is entered instead of “ l - e - n ”. the frequently used group could be converted , automatically or at the instruction of the user , into a distribution list having a name . for example , in either fig2 or 3 one could right click on the group of names that is prompted and select an option from a drop down menu ( not shown ) to convert the group into a distribution list . the user could further input a desired name for the list . alternatively , the user could select from the drop down menu an option to delete or edit the group without changing it to a distribution list . by deleting the group , it would be flagged as not being eligible for redesignation as a frequently used group . the user could edit the group by adding new members or removing existing members . the monitoring operation of the module 168 will now be described with reference to fig4 and 5 . in step 500 , a stimulus is detected . the stimulus can be any suitable event , such as clicking on the “ send ” icon in an originated , forwarded , or replied message , or clicking on a “ learn ” command . in a learn command , the user selects a number of historical messages and , by then clicking on the “ learn ” command triggers the module 168 into analyzing the historical messages as if they had just been sent . in other words , the timestamps of the messages would be ignored in determining whether or not identifiers in the “ to ” and / or “ cc ” fields 200 and 216 , respectively , and / or “ bcc ” field constituted a frequently used group . in one configuration , each of the selected historical messages would be added automatically as a frequently used group regardless of the number of instances of occurrence . in decision diamond 504 , the module 168 determines whether or not the identifier group ( if any ) in the selected message matched an existing group stored in memory . fig4 shows an exemplary set of data structures used by the module 168 . each frequently used group has a respective group id 400 , an associated listing 404 of member identifiers , an associated counter value 408 recording a number of instances of use of the group over a selected time period ( e . g ., one month ), an associated timestamp 412 indicating when the group was last used , a flag value 416 indicating whether or not the associated group qualifies as a frequently used group , and a name 420 associated with the group , if any . in one configuration , the data structures may include one or more describers of the nature , purpose or intent or an associated activity of the group . for example , one or more words used in the subject matter of the “ subject ” field 220 or 308 or message field 224 or 312 may be listed as a describer . when the membership of the selected group does not match membership of an existing ( stored ) group , the module 168 in step 508 creates the data structures of fig4 , with the instance counter value being “ 1 ”, the timestamp 412 being a timestamp associated with the message ( such as when the message was sent by the user ), the flag value is “ 0 ”, and optionally one or more describers in the description field . the describers may be selected by parsing the subject and / or message text fields 220 and 308 and / or 224 and 312 , respectively . the membership of the group may be based on the entries in the “ to ” field 200 or 304 alone , the “ cc ” field 216 or 316 alone , the “ bcc ” field ( not shown ) alone , or the fields collectively . when analyzed collectively , the group members 404 may include an indicator ( not shown ) of whether the member was used in the “ to ”, “ bcc ”, or “ cc ” field . when the module 168 , in response to a user election from the drop down list , later populates the “ to ”, “ bcc ”, and “ cc ” fields to reflect the selected group , the member identifiers may be populated in the field indicated by the associated indicator . when the selected group matches a stored group 404 , the module 168 , in step 512 , increments the instance counter value 408 , in step 516 updates the timestamp 412 to reflect a timestamp of the selected message , and in decision diamond 520 determines whether the group 404 qualifies as a potential frequently used group . this determination can be based on any useful criteria . preferably , the criteria is whether the instance counter value 408 has a threshold value . in one configuration , each entry has a number of timestamps 412 , each indicating an instance of use of the associated group . the module 168 periodically ages out older timestamps and decrements the instance counter value 408 accordingly . in other words , the instance counter value is adjusted to reflect a number of instances of use of each group over a selected period of time . when the group fails to qualify as a frequently used group , the module 168 returns to step 500 and awaits the next stimulus . when the group now qualifies as a frequently used group , the module 168 , in optional step 524 , prompts the user to create a new frequently used addressee group . in other words , a frequently used addressee group is not made automatically but must be accepted by the user . when optional step 524 is performed , the module 168 , in optional decision diamond 528 determines whether the user has responded within a selected period of time to the prompt to add the group as a new group . when the user indicates that the group is not to be recognized as a frequently used group or when a time out occurs , the module 168 returns to and repeats step 500 . in one configuration , when the user indicates that the group is not to be recognized as a frequently used group , the group is identified as being ineligible to be recognized as such a group . this prevents repeated prompting of the user in step 524 for the same group which the user has previously identified as not being eligible for recognition as a frequently used group . depending on the configuration when the user response in decision diamond 528 is to create a frequently used group or when the group qualifies as a potential frequently used group in decision diamond 520 , the module 168 sets the flag value 416 to “ one ” indicating that the group is to be processed in the future as a frequently used group . the autocompletion function according to an embodiment of the present invention will now be described with reference to fig6 . in decision diamond 600 , the module 168 detects a stimulus . the stimulus is the user entering a selected number of characters in the “ to ”, “ bcc ”, or “ cc ” fields . the selected number of characters may be as few as one . the stimulus occurs independently for each new identifier entered into one of the fields and occurs repeatedly for the same identifier as more characters are entered by the identifier . this typically causes the number of listed identifiers in the drop down list to decrease as more characters in the identifier are received . in step 604 , the module 168 identifies potential single and group identifier matches . for group identifiers , this step frequently includes the previously completely entered identifiers in the “ to ”, “ bcc ”, and “ cc ” fields . for groups , the use of one or more previously entered identifiers and a partial current ( incomplete ) identifier can provide a much more accurate estimate of likely groups by eliminating unmatched groups . in step 608 , the module 168 applies selected criteria to rank the matching single and frequently used group identifiers . the ranking may be based on probability of a complete identifier match and / or type of identifier . by way of example , the selected criteria can be based upon type of identifier ( whether it is a single or frequently used group member identifier ), when a frequently used group member identifier the existence and / or number of previously entered group member identifiers in the “ to ” and / or “ cc ” fields , the recency of last use ( or timestamp value ) of the single identifier or frequently used group , the instance counter value of the single identifier or frequently used group , the existence of one or more descriptors in the subject and / or message text fields of the message , for a frequently used group member identifier the number of group members , and maximum drop down list length . the use of descriptor instances in the ranking determination is particularly useful where the user has already fully or partially completed the subject or text message field or when the user is forwarding or replying to a message . to identify instances of descriptors in one or both of these fields , the contents of the fields , if any , would need to be parsed to identify occurrences of the descriptors . in step 612 , the matching single identifiers and frequently used groups are then ordered based upon their relative rankings and displayed to the user in a drop down list . in decision diamond 616 , the module 168 determines whether or not the user selected one of the listed message identifiers or frequently used groups within a selected period of time ( which may end when the next character is entered ). if not , the module 168 returns to and repeats step 600 . if so , the module 168 , in step 620 , completes the “ to ”, “ bcc ”, and / or “ cc ” fields to be the selected item and returns to step 600 . a number of variations and modifications of the invention can be used . it would be possible to provide for some features of the invention without providing others . for example in one alternative embodiment , the frequently used group can be created from an electronic calendar entry , such as outlook ™. for example , an invitation can be used as the basis for creating a frequently used group , such as using the learn command referenced above or by automated monitoring the accepted invitation . in another alternative embodiment , an identifier could be added to an existing frequently used group or distribution list directly from a message or calendar entry . for example , if the user has defined a “ patent team ” distribution list and someone sends an email asking to be added to the team , the user can add the new person to the distribution list directly from the email . one way to accomplish this would be to allow the user to right - click on the new person &# 39 ; s name , which would pop up a menu on which “ add to distribution list ” would be an option . in yet another alternative embodiment , auto - completion of the entire distribution list or invitee list when composing a message or scheduling a meeting is enabled . currently , autocompletion in messaging and scheduling applications works on a per - person basis . when the user begins to type in a recipient &# 39 ; s identifier , the module 168 would show options for automatically populating the entire distribution or invitee list . the options would include recently - used , unnamed distribution lists . for example , if the sender were to have previously sent or received a message addressed to jimmy carter , ron reagan , and jerry ford and has also sent or received a message addressed to jimmy carter , george bush , and bill clinton . when the sender begins to type “ c - a - r - t ”, he would be presented with the following options : the user could administer a maximum time that an unnamed distribution list would be presented as an option or could administer a limit on the number of candidate distribution lists presented . in yet another alternative embodiment , in the drop down list of matching identifiers a method for choosing from recent distribution lists is provided . an editable combination box is used for this purpose . an example is the address field in internet explorer ™. the distinction between this embodiment and prior embodiments is that the user would need to start typing one of the recipient &# 39 ; s identifiers to see the set of recent distribution lists . the set of recent distribution lists could also include lists where the user was a recipient and not simply those where he or she was the sender . the recent distribution lists includes not only frequently used , recent groups but also user configured distribution lists and identifier groups that may not be frequently used but have been recently used . in yet another embodiment , a method for searching for candidate distribution lists based on message titles or contents is provided . this embodiment is similar to searching for messages containing certain words in their titles or contents . instead of presenting the list of messages found by the search , the module 168 would present the distribution list for those messages . this is a convenient way to contact people whose identifiers are not remembered or otherwise unknown to the user provided that the user remembers the subject matter with which he or she corresponded previously with such persons . the descriptors described previously could be used in identifying such distribution groups . in yet another embodiment , a method for creating automatically a distribution list based on the subject of a message or meeting invitation is provided . for example , if the user were organizing a happy hour , one could type “ happy hour friday ” in the subject line of a message , and the messaging or calendar application would search through past messages and appointments for “ happy ”, “ hour ”, and “ friday .” the software would then use the distribution lists from the messages that best match the search to compile a distribution list for the new message . the sender would then have the opportunity to remove unwanted identifiers from the distribution list before sending the message . as in the prior embodiment , descriptors could also be searched to identify potential distribution lists . in the prior embodiments , distribution lists can include not only frequently used , recent groups but also user configured distribution lists and identifier groups that may not be frequently used but have been recently used . in yet another embodiment , dedicated hardware implementations including , but not limited to , application specific integrated circuits or asics , programmable logic arrays , and other hardware devices can likewise be constructed to implement the methods described herein . furthermore , alternative software implementations including , but not limited to , distributed processing or component / object distributed processing , parallel processing , or virtual machine processing can also be constructed to implement the methods described herein . it should also be stated that the software implementations of the present invention are optionally stored on a tangible storage medium , such as a magnetic medium like a disk or tape , a magneto - optical or optical medium like a disk , or a solid state medium like a memory card or other package that houses one or more read - only ( non - volatile ) memories . a digital file attachment to e - mail or other self - contained information archive or set of archives is considered a distribution medium equivalent to a tangible storage medium . accordingly , the invention is considered to include a tangible storage medium or distribution medium and prior art - recognized equivalents and successor media , in which the software implementations of the present invention are stored . although the present invention describes components and functions implemented in the embodiments with reference to particular standards and protocols , the invention is not limited to such standards and protocols . other similar standards and protocols not mentioned herein are in existence and are considered to be included in the present invention . moreover , the standards and protocols mentioned herein and other similar standards and protocols not mentioned herein are periodically superseded by faster or more effective equivalents having essentially the same functions . such replacement standards and protocols having the same functions are considered equivalents included in the present invention . the present invention , in various embodiments , includes components , methods , processes , systems and / or apparatus substantially as depicted and described herein , including various embodiments , subcombinations , and subsets thereof . those of skill in the art will understand how to make and use the present invention after understanding the present disclosure . the present invention , in various embodiments , includes providing devices and processes in the absence of items not depicted and / or described herein or in various embodiments hereof , including in the absence of such items as may have been used in previous devices or processes , e . g ., for improving performance , achieving ease and \ or reducing cost of implementation . the foregoing discussion of the invention has been presented for purposes of illustration and description . the foregoing is not intended to limit the invention to the form or forms disclosed herein . in the foregoing detailed description for example , various features of the invention are grouped together in one or more embodiments for the purpose of streamlining the disclosure . this method of disclosure is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim . rather , as the following claims reflect , inventive aspects lie in less than all features of a single foregoing disclosed embodiment . thus , the following claims are hereby incorporated into this detailed description , with each claim standing on its own as a separate preferred embodiment of the invention . moreover , though the description of the invention has included description of one or more embodiments and certain variations and modifications , other variations and modifications are within the scope of the invention , e . g ., as may be within the skill and knowledge of those in the art , after understanding the present disclosure . it is intended to obtain rights which include alternative embodiments to the extent permitted , including alternate , interchangeable and / or equivalent structures , functions , ranges or steps to those claimed , whether or not such alternate , interchangeable and / or equivalent structures , functions , ranges or steps are disclosed herein , and without intending to publicly dedicate any patentable subject matter .