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The UN has been using simplifed (and not traditional) Chinese characters since the 1970s. That's when the official Chinese representation here switched from Taipei to Beijing.
Since Beijing used simplified characters in its official communications, that's the form that was adopted by the UN.
The UN never used both forms simultaneously. So these reports about a switch to simplified characters that will happen in 2008 are not correct. We already use simplified characters.
If you have any further questions, feel free to call me.