iChat used the H.264/AVC codec, which offered superior quality video compared to the older H.263 codec used in previous versions. This release supported the XMPP protocol, which could be directly used to connect to Google Talk and indirectly be used to connect to users of services including Facebook Chat, and Yahoo! Messenger. However, support was limited as it did not support several common XMPP features such as account creation, service discovery and full multi-user chat support. iChat 3 included the Bonjour protocol (previously called Rendezvous) which allowed iChat to automatically find other users with iChat Bonjour messaging enabled on the local network. In October 2005, iChat received support for encrypted communications, but only for paid subscribers of .Mac (now iCloud) service. These features were part of iChat 3.1, released as part of the Mac OS X v10.4.3 update. This version also added support for XMPP multi-user chat. In March 2007, Apple released the Mac OS X v10.4.9 update, which allowed USB video device class (UVC) cameras to be used with iChat, rather than FireWire cameras only. This allowed a wider range of cameras to be used with iChat AV. iChat 4 iChat 4 was introduced as a part of Mac OS X 10.5 and received new features including: iChat Theater (inspired by ChatFX a product from Plum Amazing), Backdrops, and Screen Sharing. iChat Theater allowed users to share any file supported by Quick Look, including photos, Keynote presentations, and movies, over a video chat session. Backdrops allowed users to insert movies or photos as a backdrop in video chats. Screen Sharing allowed two users of Mac OS X Leopard to have control of the same desktop and work collaboratively. Minor features in the new release included multiple logins, animated icons, use of Photo Booth effects in live video chat, and tabbed chats. iChat 5 iChat 5.0, released with Mac OS X 10.6, reduced the bandwidth required for 640×480 video chats and upgraded iChat Theater to the same resolution. iChat 6 iChat 6.0, released with Mac OS X 10.7, added support for Yahoo Messenger account and allowed iChat users to have text, voice and video chats using their Yahoo Mail accounts. It also supported third-party plugins, eventually allowing other protocols to be compatible with the software. iChat 6 was the last iChat version; in OS X Mountain Lion, it was replaced by Messages. The final release, iChat 6.0.1, was published on