Microsoft has launched an instant messaging client, to compete with similar clients from Yahoo! (Yahoo! Messenger) and ICQ from AOL, provoking a row with the latter. Microsoft's MSN Messenger can exchange messages with ICQ, which AOL claimed is "akin to hacking" into users of its clients.
Microsoft claims that it did not steal any technology from AOL, and is lobbying for all instant messaging clients to be interoperable. As a result, The Internet Engineering Task Force has formed the Instant Messaging and Presence Protocol (IMPP) Working Group.
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