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Empathy is a client built on the Telepathy messaging framework. However, 
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without a proper backend (connection manager) installed, it is essentially
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useless.
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XMPP, as a standardized and unencumbered protocol, is supported by default
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through the Gabble (Jabber and GoogleTalk) and Salut (link-local) connection
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managers. 
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Support for AIM/ICQ, MSN, Gadu-Gadu, Groupwise, QQ, and Yahoo! are all provided
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by Haze (installed by default with Empathy).
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However, more are available in Fedora which implement other protocols available
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for Empathy. They are as follows, listed by their package name:
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* telepathy-butterfly: MSN
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* telepathy-idle: IRC
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If you wish to us any of these protocols with Empathy, you will need to
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install the appropriate package for the connection manager and configure
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the account through Empathy's "Accounts" dialog.