Hi Cken
On your computer could you find any file which is . dbx as its extension which is created between the date that the email is missed? Apparently
<<在您安裝此更新, 是每個一次, 壓縮資料庫建立 . dbx 檔案的備份複本。 成功地壓縮, 資料庫後的 . dbx 檔案備份副本移至 [ 資源回收筒 ]。>>
Not sure if you have cleared your rubbish bin.
If not maybe you can restore the email from that file. Otherwise you may need to find some software to recover that file from your hard drive to find those file and restore them back to OutLook Express email.
Do not know if you will find the following URL useful.
http://support.microsoft.com/kb/918069Please forgive me if my concept is not right.
Good luck