Enterprise IM?
Jsf72672 asks: "With the recently-passed Sarbanes-Oxley legislation, and the looming HIPAA compliance requirements a constant thorn in the side of IT staff, Enterprise Instant Messaging seems to be overlooked. Most users are using AIM or MSN. Microsoft and Yahoo! both have products tailored to the Enterprise, but no one wants to rely their technology to keep them out of jail, or from paying huge fines. Jabber looks attractive but our already overtaxed IT staff does not have the time to compile, secure and test homegrown solutions. What are Slashdot-reading IT Managers doing? I found these guys and their InterIM line of products, and they look pretty good. Is anyone using them? Are there other low-cost solutions you have employed?"
It's not just open source, the XMPP protocol is approaching RFC status, and there is a whole suite of commercial products utilizing it.
Just take a gander at the Sponsors box on jabber.org for starters. You'll find products that drop into almost any environment, are based on open technologies, and can be complimented by many hundreds of open source apps... what could be better?
Closed IM systems are a thing of the past, if we want them to be.
Do realize there is more than a single commerical vendor for Jabber? For instance Jive Messenger has an unlimited user license for $4500. Now granted you probably wouldn't want to handle 10,000+ users on a single Jive Messenger instance but there are less expensive options than Jabber Inc. However, with Jabber Inc's solution you can easily scale to hundreds of thousands of users, something that very few, if any, other IM products are capable of.