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Most CMS applications like Joomla have some kind of a internal messaging system, and forum applications like vBulletin can optionally allow members to send instant messages to each other either within the system or through email.
vBulletin is not free so I've never use it, but already tried w/ Joomla older version and it doesn't work since all users are remotely access, and when they sign up, it reply on email for confirmation and activation, but wamp doesn't come w/ mail server. Not sure if the current Joomla version would overcome that issue so it could be used for local access only
Have fun,
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