If the proxy support UPNP, MSN messenger will all ok. If the proxy support NAT, make sure inner network computer can make a tcp link on port 1863 to internet through the proxy/firewall, then the messenger can send message.
other ports:
audio/video TCP/UDP <>6901/ 5004 ¨C 65535
files TCP <>6891~6900
program share/White Board TCP <>1503
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