Rafe postulates on the future of instant messaging. “A Microsoft product manager says that the future of IM is all companies managing the identities of people inside their organization, and the usage of a clearinghouse to broker connections between organizations.” Of course, this is *exactly* what Jabber does. A Jabber server is exactly analogous to an email server. Each email server is responsible for one or more domains, email clients connect to email servers. A Jabber server is responsible for one or more domains, Jabber clients connect to Jabber servers. And just like email, the protocol is open for anyone and everyone to use and implement.
Zephyr (MIT’s IM software, created in 1988) does this too… each site is considered a “realm”.