Search: in
ICQ in Encyclopedia Encyclopedia
  Tutorials     Encyclopedia     Videos     Books     Software     DVDs  


ICQ is an instant messaging computer program, which was first developed and popularized by the Israeli company Mirabilis, then bought by America Online, and since April 2010 owned by Group. The name ICQ is a homophone for the phrase "I seek you". This is an adaptation of the Morse code callout "CQ", which means "calling any station".

The first version of the program was released in November 1996 and ICQ became the first Internet-wide instant messaging service, later patenting the technology.[1] AOL acquired Mirabilis on June 8, 1998, for US$407 million.

In 2001, ICQ had over 100 million accounts registered.[2] In April 2010, AOL sold ICQ to Digital Sky Technologies for $187.5 million.[3]



Mirabilis was first established in 1996 by five Israelis: Yair Goldfinger, Sefi Vigiser, Amnon Amir, Arik Vardi, and Arik's father Yossi Vardi. They recognized that many people were online accessing the Internet through a non-UNIX operating system, and that there was no software that enabled an immediate connection between them.

What was missing was the technology for locating and connecting the users of the Windows operating system.

The technology Mirabilis developed for ICQ was distributed free of charge. The technology's success caused AOL to acquire Mirabilis on June 8, 1998, for US$407 million. At the time, this was the highest price ever paid to purchase an Israeli technology company.

ICQ's management changed at the end of 2003. Under the leadership of the new CEO, Orey Gilliam, who also assumed the responsibility for all of AOL's messaging business in 2007, ICQ resumed its growth and turned into a highly profitable company, and one of AOL's most successful businesses.

Eliav Moshe replaced Gilliam in 2009 and became ICQ's managing director.


  • ICQ features include offline user messaging, multi-user chats, free daily-limited SMS sending, resumable file transfers, greeting cards, multiplayer games and a searchable user directory.
  • ICQ6 was launched on April 17, 2007, and offered a single communication platform that combines the various user options: instant messaging services, free SMS from ICQ to mobile, voice and video communication. The software's new sound gallery was orchestrated by the Israeli psychedelic trance duo Infected Mushroom. Among the new additional features in ICQ6 are Quick IM, which allows users to send a short message without opening a conversation window, a "follow me" service directly to the user s mobile, a multi-chat service and support for Zlango, the animated icons language.

Additional products

ICQ provides all users additional services and content products:

  1. ICQ TV An online video magazine. The magazine broadcasts content for teens 24/7.
  2. ICQ SIM Card (together with United Mobile) A SIM card that enables users traveling across Europe to use their cellular telephone while paying a discount price.
  3. ICQ Game Center A games platform that enables the user to play with and/or against other users.
  4. ICQ2Go A web instant messaging option for users who cannot download the program onto their computer (for various reasons, like firewall for instance). ICQ2Go uses a port-80 browser for this type of communication feature.
  5. ICQ for Mac (Beta) Released in February 2010, a version of the client that was developed using the Adobe AIR platform, making it usable on additional operating systems which support the AIR runtime, such as Linux.[4]


ICQ users are identified by numbers called UIN, distributed in sequential order. The UIN was first invented by Mirabilis, as the user name assigned to each user upon registration. The meaning is either Universal Internet Number or Unified Identification Number. Issued UINs started at number 10000 (5 digits) and every user receives a UIN when first registering to ICQ. As of ICQ6, users are also able to log in using the specific e-mail address they associated with their UIN during the registration process. Unlike other instant messaging software or web applications, on ICQ the only permanent user info is the UIN, although it is possible to search for other users using their associated e-mail address or any other detail they have made public (by updating it in the public profile). In addition, the user can change all of his or her personal information, including screen name and e-mail address, without having to re-register. Since 2000, ICQ and AIM users are able to add each other to their contact list without the need for any external clients. As a response to UIN theft or sale of attractive UINs, ICQ started to store email addresses previously associated to a UIN.[5] As such, UINs that are stolen can sometimes be reclaimed. This applies only if (since 1999 and onwards) a valid primary email address was entered into the user profile.

Development history

First versions

ICQ was developed in 1996 by Mirabilis. The company was founded by four young Israelis: Yair Goldfinger, Arik Vardi, Sefi Vigiser and Amnon Amir. After AOL bought it, it was managed by Ariel Yarnitsky and Avi Shechter.

America Online acquired Mirabilis on June 8, 1998, for $407 million ($287 million in cash and $120 million over a three-year period based on growth performance levels).

Later versions

  • ICQ 2000 incorporated into Notes and Reminder features.
  • ICQ 2001 included server-side storage of the contact list, allowing for its synchronization on multiple computers.
  • On December 19, 2002, AOL Time Warner announced that ICQ had been issued a United States patent for instant messaging.
  • ICQ 2002 was the last completely advertising-free ICQ version.
  • ICQ Pro 2003b was the first ICQ version to use the ICQ protocol version 10. However, ICQ 5 and 5.1 use version 9 of the protocol. ICQ 2002 and 2003a used version 8 of the ICQ protocol. Earlier versions (ICQ 2001b and all ICQ clients before it) used ICQ protocol version 7.
  • ICQ 4 and later ICQ 5 (released on Monday, February 7, 2005), were upgrades on ICQ Lite. One addition was Xtraz, which offers games and features intended to appeal to younger users of the Internet. ICQ Lite was originally an idea to offer the lighter users of instant messaging an alternative client which was a smaller download and less resource-hungry for relatively slow computers.
  • ICQ 5 introduced skins support. There are few official skins available for the current ICQ 5.1 at the official website; however, a number of user-generated skins have been made available for download.
  • ICQ 6, released on April 17, 2007, was the first major update since ICQ 4. The user interface has been redesigned using Boxely, the same rendering engine used in AIM Triton. This change adds new features such as the ability to send IMs directly from the client's contact list. ICQ has recently started forcing users of v5.1 to upgrade to version 6. Those who do not upgrade will find their older version of ICQ does not start up. Although the upgrade to version 6 should be seen as a positive thing, some users may find that useful features such as sending multiple files at one time is no longer supported in the new version. At the beginning of July 2008, a network upgrade forced users to stop using ICQ 5.1 - applications that identified themselves as ICQ 5, such as Pidgin, were forced to identify themselves as ICQ 6. There seems to be no alternative for users other than using a different IM program or patching ICQ 5.1 with a special application.
  • ICQ 7.0, released on January 18, 2010. This update includes integration with Facebook and other websites. It also allows custom personal status similar to Windows Live Messenger (MSN Messenger). ICQ 7.0 does not support traditional Chinese on standard installation or with the addition of an official language pack. This has made its adoption difficult with the established user base from Hong Kong and Taiwan where traditional Chinese is the official language.


According to security analyst Jeffrey Carr, use of ICQ may cause security problems because it was purchased by Russian investment company Digital Sky Technologies. ICQ has fallen out of fashion in US and Britain, but it remains popular in eastern Europe and Russia. Carr says the new ownership may be used by Russia's powerful secret service, the FSB (formerly the KGB) since Russian law, like the american law, requires ICQ to open its logs whenever they want".[6] But so are other IMs too (see Skype security, YIM SPIM, AIM vulnerabilities etc.).


ICQ is often used for distribution of unwanted advertisement and spam.[7] This is facilitated by ICQ's use of usernames consisting of multiple-digit numbers.

Privacy and copyright

When accepting "ICQ Terms Of Service Acceptable Use Policy" (2000), a user gives all the copyright in the posted information to ICQ Inc.[8] This implies that ICQ Inc. may publish, distribute etc. any messages sent through the system that could be meant to be private:

"You agree that by posting any material or information anywhere on the ICQ Services and Information you surrender your copyright and any other proprietary right in the posted material or information. You further agree that ICQ Inc. is entitled to use at its own discretion any of the posted material or information in any manner it deems fit, including, but not limited to, publishing the material or distributing it."

ICQ accounts may be deleted with

Pressure on alternative clients

AOL pursued an aggressive policy regarding alternative ("unauthorized") ICQ clients.

  • In July 2008 changes were implemented on ICQ servers causing many unofficial clients to stop working. These users received an official notification from "ICQ System".
  • On December 9, 2008, another change to the ICQ servers was made. The clients that were sending Client IDs not matching ICQ 5.1 or higher stopped working.
  • On December 29, 2008, ICQ press service distributed a statement characterizing alternative clients as dangerous.[9]
  • On January 21, 2009, ICQ servers started blocking all unofficial clients in Russia and Commonwealth of Independent States countries.[10] Users in Russia and Ukraine received a message from UIN 1:


ICQ . ICQ web- ICQ.

System Message

The version you are using is not supported by ICQ. Download a free authorized ICQ version from ICQ s official website."

On[11] there is an "important message" for Russian-speaking ICQ users: "ICQ : ICQ Lite ICQ 6.5." ("ICQ supports only authorized versions of programs: ICQ Lite and ICQ 6.5.")

  • On February 3, 2009, the events of January 21 have repeated.


AOL's OSCAR network protocol used by ICQ is proprietary and using a third party client is a violation of ICQ Terms of Service, nevertheless a number of people have created more or less compatible, third-party clients, by using reverse engineering and protocol descriptions available on the net. These clients include:

  • Adium: supports ICQ, Yahoo!, AIM, MSN, Google Talk, XMPP, and others, for Mac OS X;
  • Ayttm: supports ICQ, Yahoo!, AIM, MSN, IRC, and XMPP;
  • bitlbee: IRC gateway, supports ICQ, Yahoo!, AIM, MSN, Google Talk, and XMPP;
  • centericq: supports ICQ, Yahoo!, AIM, MSN, IRC and XMPP, text-based;
  • climm (formerly mICQ): text-based;
  • Easy message: supports MSN, AIM, ICQ, and Yahoo!;
  • eBuddy: web-based, supports MSN, AIM, Yahoo!, ICQ, Google Talk and MySpace Chat;
  • Fire: supports ICQ, Yahoo!, AIM, MSN, IRC, and XMPP, for Mac OS X;
  • iChat: uses ICQ's UIN as an AIM screenname, for Mac OS X;
  • Jimm: supports ICQ, for Java ME mobile devices
  • Kopete: supports AIM, ICQ, MSN, Yahoo, XMPP, Google Talk, IRC, Gadu-Gadu, Novell GroupWise Messenger and others, for Unix-like;
  • Meebo: AJAX-based, supports ICQ, AIM, Yahoo!, MSN, Google Talk and XMPP;
  • Meetro: IM and social networking combined with location; supports AIM, ICQ, MSN, Yahoo!;
  • Miranda IM: supports ICQ, Yahoo!, AIM, MSN, IRC, Google Talk, XMPP, Gadu-Gadu, BNet and others, for Windows;
  • Naim: ncurses-based;
  • Palringo: Supports various protocols such as AIM, Yahoo!, MSN, XMPP, Google Talk, Gadu-Gadu, ICQ, Facebook IM, as well as its own proprietary IM protocol under the same name;
  • Pidgin (formerly Gaim): supports ICQ, Yahoo!, AIM, Gtalk, MSN, IRC, XMPP, Gadu-Gadu, SILC, Meanwhile (IBM Lotus Sametime) and others;
  • PlayXpert: supports ICQ, AOL Instant Messenger, Google Talk, Sony Station Friends, MSN, Yahoo! Messenger, and Xfire;
  • QIP: supports ICQ, AIM, and partially XMPP and XIMSS;
  • stICQ: supports ICQ, for Symbian OS;
  • Trillian: supports ICQ, Yahoo!, AIM, MSN, IRC, Google Talk, XMPP and others;

AOL has recently begun making its ICQ software more AIM-like by adding AIM Smilies, as well as introducing cross AIM ICQ communication. Such capability made it to beta stages, but AOL announced discontinuation of cross AIM-ICQ communication on November 5, 2010.

See also


External links

als:ICQ ar: az:ICQ be:ICQ be-x-old:ICQ bg:ICQ cs:ICQ da:ICQ de:ICQ es:ICQ eo:ICQ fr:ICQ gl:ICQ ko:ICQ hy:ICQ hr:ICQ id:ICQ ia:ICQ it:ICQ he:ICQ lt:ICQ lmo:ICQ hu:ICQ nl:ICQ ja:ICQ no:ICQ mhr:ICQ uz:ICQ pl:ICQ pt:ICQ ru:ICQ sq:ICQ sk:ICQ sl:ICQ sr:ICQ fi:ICQ sv:ICQ tt:ICQ tr:ICQ uk:ICQ zh-yue:ICQ zh:ICQ

Source: Wikipedia | The above article is available under the GNU FDL. | Edit this article

Search for ICQ in Tutorials
Search for ICQ in Encyclopedia
Search for ICQ in Videos
Search for ICQ in Books
Search for ICQ in Software
Search for ICQ in DVDs
Search for ICQ in Store


ICQ in Encyclopedia

Home - Add TutorGig to Your Site - Disclaimer

©2011-2013 All Rights Reserved. Privacy Statement