Existing users, 
ICQ was developed in 1996 by Mirabilis, the creators of the first fully functional Internet-wide Instant messenger comprising presence, buddy list, and rapid messaging. Since its early days, ICQ's mission has been not only to provide the world with quick and rich communication tool; the ICQ idea is to provide people, individuals, and groups, around the world with the most complete means to find each other and communicate better.
ICQ
Company Info
http://www.icq.com/
+972-3-7665555
285 North Wolfe Road
Sunnyvale, CA
Technical and Customer Support Info
Technical Support:
http://www.icq.com/help/
macbug@icq.com
Customer Support:
Developer: Update Info
