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Reining in public IM There is no question that IM is entrenched in the enterprise. More than 90 percent of businesses report IM activity, according to Osterman Research. A main reason, as we discovered in "Getting serious about enterprise IM," is the improved productivity and reduced communications costs that IM delivers. What should concern CIOs is that unsanctioned consumer IM networks -- such as those from America Online, ICQ, Microsoft, and Yahoo -- make up 80 percent of corporate IM use today, and the number of users of these unsecured IM networks is growing at a fast clip, according to The Radicati Group. True, public IM networks offer enterprises some protection, such as very basic identity control. But organizations are still exposed to a multitude of security risks, including viruses and breached firewalls. 