US instant messaging market: AOL – 41.6 mln users, Yahoo! – 19.1 mln, MSN – 14.1 mln

In July 2005 AOL IM and ICQ had about 41.6 mln US users, followed by Yahoo! Messenger with 19.1 mln, and MSN Messenger with 14.1 mln, according to ComScore Media Metrix.