Chinese characters not readable in Outlook 2003

some of users were able to read chinese characters email in outlook 2003 and the last few days they were not able to. all characters are turned into ????? ??? .

some can be readable in Preview Pane but once you clicked on the email to open the characters turns into ????

is this client Outlook problem or the Exchange itself?

we are all using Outlook 2003 and the exchange is Exchange 2003.
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Have a look at the mail header of the mails, there you can see the charset, which is referenced by the mail. Compare the charsets to mails, you can read, just to find out, if this is a charset issue.
hiephoAuthor Commented:
the header seems to be correct
<meta http-equiv=Content-Type content="text/html; charset=big5">

The Mail header, this is a HTML header.

It look like
Content-Type: text/html; charset=iso-8859-1

Rightclick the mail in outlook and select "options"
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hiephoAuthor Commented:
it does not have that in the header
I would say, every mail has this in the header!??, Can you post it (partially)
hiephoAuthor Commented:
i wish i could. i right-click on the mail > Options > Internet headers: there is nothing here.

Then, it is probably a internal mail, there is no header shown. If the mail, you can not see, is from a internal user, it may be that a font is used (especially if this is HTML, which is not installed on your client and for which you do not have a replacement font. This you should check on the senders side. If it is an external mail, there should be a header...

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