I am running Meetingplace 6, it is currently running Java 6 Update 45, This version of JAVA is susceptible to vulnerabilities.
Has anyone tested Java 7 to see if Meetingplace 6 still works with the latest Java Version installed?
The only component for MeetingPlace 6.x that depends on Java is MeetingPlace Directory Services (MPDS), which is the Active Directory/LDAP integration for automatic user profile creation. Unless you're using MPDS it should work fine. If you do have MPDS, this was never tested with Java 7 and we would have no idea if it would continue working with it. The web conferencing is based on Flash Player so that should not be affected.
It doesn't look like that is available publically since End of Public Updates for Java 6 was Feb 2013 according to this notice:
It looks like the latest one is Update 45: