“According to ComScore Media Metrix, ICQ — the original instant messaging (IM) service to gain mass popularity — claimed a declining user base of 6 million in June of 2003. In this same time period, the Jabber Software Foundation (JSF) estimated that there were nearly 10 million end users of software based on the open Jabber/XMPP protocol. While it is difficult to count distinct Jabber users because the network is growing so fast and includes many servers on large corporate intranets, the JSF's estimate includes more than 4 million paying customers of Jabber, Inc.'s commercial software as well as an estimated 6 million users of open source and other commercial implementations of the Jabber/XMPP protocol.”
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