A CNet story talks about the insecurity of IM services and the competition to provide IM services to businesses. Among those mentioned is the Open Source Jabber. "Jabber, a commercial product based on open-source development
organization Jabber.org, recently released Jabber 1.7 for the
Windows operating system, which lets its users encrypt messages
both when they're in transit and when they're logged on to the
sender's or recipient's computer. The updated version also adds
directory searching, a new interface, conferences, and support for
file transfers via server and peer-to-peer."
April 26, 2001