Assuming it uses XMPP or something similar, it *might* be possible
Integration Guide for Configuring Cisco Unified Presence Release 8.6 for Interdomain Federation
http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cups/8_6/english/integration_notes/Federation/CUP_8.6_Interdomain_Federation.html
There's Jabber for MAC, why don't go that way??
HTH
java
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate