OWA Send Chinese chars

When i create a new mail using owa it becomes unreadable after send. The weird thing is that signatures added by Exclaimer are ok.

I’m using Exchange 2003

This is how it looks like :
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䠼䵔⁌楤㵲瑬㹲䠼䅅㹄㰊䕍䅔栠瑴⵰煥極㵶潃瑮湥⵴祔数挠湯整瑮∽整瑸栯浴㭬挠慨獲瑥甽楮潣敤㸢㰊䕍䅔挠湯整瑮∽卍呈䱍㘠〮⸰㜵〰㘮?慮敭䜽久剅呁剏㰾䠯䅅㹄㰊佂奄ਾ䐼噉㰾但呎映捡㵥牁慩潣潬㵲〣〰〰?楳敺㈽吾卅⁔䕄吠卅㱔䘯乏㹔⼼䥄㹖⼼佂奄㰾䠯䵔㹌
Mocht u nog aanvullende vragen hebben, dan beantwoorden wij die graag voor u.
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