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no, msn doesn't support video or audio on mac, you can use mercury messenger, it supports audio and video, and in the future the very nice adium will also support it!!
 
Also, now if you go to www.mactopia.com and then read the blog they state that right now they are working on messenger 7 for mac and they are going to add audio and video compatibility...
 
What about running Windows XP via Parallels, and then using MSN for Windows? Will it see the iSight?
 
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