TUAW posts another rumor from the latest iPhone firmware 2.0 build released last week that indicates Apple is planning Jabber/XMPP support.
Our anonymous iControl tipster has returned and tells us that a new XMPP framework has been spotten in the latest iPhone firmware. XMPP refers to the open source standard developed by the Jabber community for instant messaging. Remember back in March when Apple announced it would support native instant messaging? In a nutshell, it looks like Apple's new iPhone-based chat will be built on Jabber/XMPP.
The support remains private to Apple's built-in applications, so 3rd party developers utilizing Apple's API are not able to access the functionality.
Speculatively, it is possible that Apple may be building this functionality for enterprises running Mac OS X Server or other Jabber-based instant message servers.