A system and method for immediate and delayed real-time communication activities using availability data from and communications through an external instant messaging system, that operates to obtain aggregated user online presence information through its own client software, through interception of client-server...http://www.google.de/patents/US20040162881?utm_source=gb-gplus-sharePatent US20040162881 - System and method for immediate and delayed real-time communication activities using availability data from and communications through an external instant messaging system
