charset problem in index view

[bill lam]

When the header was
From: =?big5?q?=ABab=20=AAL?= <[EMAIL PROTECTED]
it display "from" in index view
=?GB2312?B?udpi 

however when the header was
From: =?gb2312?q?=BD=F0=D8S=B3=C7?= <[EMAIL PROTECTED]
it displayed as
=?BIG5?B?qvfC16

Both displayed correctly in pager view.

regards,