[NetMeeting] Best Mac compatible for NM ?

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Hi   First time message to this list!   Checked around but could not find answers to my current problems concerning N Meeting.   I am in UK and have Net Meeting (lastest version) and would like to talk to my Mac PC owning colleague in Belgium.  As there is not a Mac version of NM that I am aware of, does anyone know the best suitable software (preferably free) that he could use on his Mac that would be compatible with my NMeeting.   2)  What server address would be best to work with this combination ?  At the moment I am on the default Microsoft server, whatever address that is, and presumably that would work ok?   Thanks in advance !   Chris T Hanley