By and large, XMPP based products interoperate with other the way one would expect. We use a commercial XMPP based system in our environment and end users will happily use IM clients other than the one provided by the system vendor (Apple's iChat, for example). In addition, we are able to federate with other XMPP networks like gmail.com without significant problems. This is analogous to the SMTP model you mention in the article.
In the SIP/SIMPLE world, Microsoft's SIP does not interoperate with IBM's SIP or anyone else's for that matter. While there are SIP/SIMPLE standards, they are numerous and challenging to adhere to. Microsoft, IBM, and all other SIP/SIMPLE players have yet to achieve anything like the interop found today in the XMPP world.
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Interesting.. one point though..
IBM does support XMPP - through the Sametime Gateway.
It's not how many standards, but how truly open they are
XMPP and SIP/SIMPLE can be effectively federated, as my employer, Jabber, Inc., and others have proven. It is the use of proprietary undocumented standards (including vendor-specific modifications) that causes the most pain.
From an IT risk management standpoint, enterprises should avoid products and systems based on standards that are not completely open. XMPP's protocol governance model encourages openess and standards compliance.
The Barracuda IM Firewall also supports XMPP
We have the Barracuda IM Firewall which provides an embedded XMPP server in an appliance form factor. The Barracuda IM Firewall is interoperable with Jabber and Google Talk, too.
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