Internal IM solution for SBS 2011/2008R2

I've got a couple clients that keep wanting IM solutions for internal chat capabilities. both have elevated security concerns, and I need to ensure internal only connections, no file transfers, no remote control links.  either no video voice, or limited.

and the client needs to be controllable from the server or GPO only.

Any one know something pre-canned and not crazy extensive?  I've taken a quick look at Lync but it seems ridiculously more complex and expensive than required to provide internal "chatting" capability.
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R. Andrew KoffronAsked:
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Neil PreeperCommented:
I'm using openfire with sparks chat client, connected using LDAP. its free and runs on java. does not use a lot of resources.  

I too was in the same boat as you. Installed this solution in less than 3 hours.


http://www.igniterealtime.org/projects/openfire/
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