Now a couple of our users can't view chinese attachements in MS Outlook 2003."
Could you expand on that a bit. Is it that they don't see the Chinese characters within the body of the message, or is it that they are forced to save an attachment before opening it?
Exchange 2003 and 2007 both leverage the language setting on the server. In windows 2003 control panel, regional settings, you install the files to support east asian languages. In OWA there are two setting that determine which language is used for display in the client browser. If this is an issue with displaying the character set, then I suspect your OWA setting are correct and you need only add the language support files on the exchange server.
If this is an attachment issue, then what kind of attachment? If you view the RFC822 message, and scroll down to the message part for the attachment, how was it encoded? attachment/octet-stream?
If it's encoded like this,
------=_Part_316_16116684.1222093617759
Content-Type: application/octet-stream; name="Newsletter 200809.doc"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="Newsletter 200809.doc"
then outlook attachment security forces a save. If it's encoded like this,
------_=_NextPart_001_01C91924.7E2B26AA
Content-Type: application/vnd.ms-excel;
name="Weekly Report 091508.xls"
Content-Transfer-Encoding: base64
Content-Description: Weekly Report 091508.xls
Content-Disposition: attachment;
filename="Weekly Report 091508.xls"
I can just click on the attachment and open it. The application/octet-steam mime type is the default used when no mime type is associated with the file extension. It's also in the level2 block list for OAS.