Why Skype doesn't use XMPP

XMPP - Extensible Messaging and Presence Protocol

XMPP is a communication protocol used for messaging, multi-user conferencing, online status viewing, and file transfers. The XMPP protocol was originally developed in 1998 by the Jabber project, whose task is now continued by the XMPP Standards Foundation. In 2004 the IETF published XMPP as the official standard.
The XMPP protocol is used as the basis for various instant messaging services. XMPP can be found, for example, in Apple's iChat and Google's Gtalk. The microblogging service Twitter uses XMPP to deliver its entire message stream to external providers.

At least one XMPP server is required to operate an XMPP network. This server can establish connections to other XMPP servers via the Internet. The network architecture is reminiscent of SMTP. The participants log on to an XMPP server via their clients with a user ID that is similar to an e-mail address.

Jabber

Jabber is a freely available client-server system for instant messaging, which is mainly used for chatting. With a collection of XML-based network protocols, Jabber is an alternative to proprietary instant messaging services such as Skype or ICQ.

The core of Jabber is the XMPP protocol, which was largely promoted by the Jabber company. Although Jabber was bought by Cisco, the software, specification, and service are still available on www.jabber.org, along with numerous public and semi-public Jabber servers.

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