Chat server setup (secure)

This projects involves the installation and setup of a dedicated chat server (open source)? on two of our Linux? servers (one for backup purposes), requiring the following functionality: - Secure data transmission (encrypted or SSL based) - Server runs Fedora Core 7 - Windows, Linux and web (https) client - friends list with online status - chat conference support - logging of chat data on server (with relatively easy access) -? basic graphical? emoticon support - easy client setup - supports up to 100 concurrent users - possibly including video support (not mandatory) We are open to suggestions regarding the software used.