Welcome to the Apple Support Communities
In Mountain Lion, iChat was replaced so now it's Messsages. You can use it to talk with an iPhone, iPod touch, iPad or Mac with Messages application, but you can also configure a Jabber, Google Talk, AIM or Yahoo! account to talk with people with other computers
iChat or Messages will Video chat to legacy versions of AIM for PC (AIM 7.x.x.x. and earlier) and Trillian with the Pro add-on to Video chat.
Jabber and Yahoo Chats are text only.
The iChat Server is a Jabber server so Jabber Buddies could be added to the client users Buddy Lists.
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously