In the inner circles of the instant messaging (IM) industry, the conversation inevitably comes around to interoperability — that is, getting public networks such as AOL, Yahoo! and Microsoft as well as proprietary systems to share IMs. The thinking is that businesses need to reach beyond the boundaries of their firewalls to talk to customers, suppliers and partners. Discussions — often heated — about SIMPLE and XMPP, which are the technologies that drive that interoperability, abound.
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