How do I configure Pidgin to allow video chat with people using WLMessenger?

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http://askubuntu.com – I have a Windows Live ID and I use it to talk with my friends, who use Windows Live Messenger 2009 or 2011. I've adopted Pidgin as conversation client because it is universal and it is cross-platform. However I still can't have video conversations with my contacts, the options are all grey and I can't configure anything. How do I configure pidgin to be able to make video and audio conversations with Windows Live Messenger users? Is there any missing plugin? (HowTos)