Well, to my knowledge, no one has posted about this before. The Chinese directory names could be the problem, but I am not very sure, still
Have you tried " 為每個紀錄檔新增一個資料夾 " (Create a different directory for each file) and see if " 七月 2004.txt " files are created under directories named with your contact's email addresses?
Err...
考不上就是考不上的啊 我還想念資工勒="=...癡人說夢話= = 剛剛唸國文唸到頭昏眼花...|||...anyway 謝謝你啦 XDD
Edit: I don't think there should be any problems changing Messenger 5 to 6...