Unable to open outlook messages saved as (.msg) Unicode

We are Exchange 2000 environment with Office XP.  An outside client saved an outlook messages as (msg) Unicode Format (I suspect) and attached it to an email message and sent it to us.  When we try to open the attached message we get "The messaging interface has returned an unknown error. If the problem persists restart Outlook.

Restarting Outlook doesn't work.  I have Exchange 2003 with Outlook 2003 at home and was able to reproduce the error message.  In Outlook 2003 there is a message format called UNICODE .msg.  You can either save a message as .msg or UNICODE .msg.  The error message came up when I saved an email message on my desktop using the UNICODE .msg format.  I sent myself an email and attached the UNICODE .msg message to my email.  When I tried to open the attachment using my Outlook at work, I received the same error message.  I am not sure what the client is doing, or maybe he is using some other email client that is causing this?

500 points for an explanation/sulution.

Thanks
goodadminAsked:
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ceecurtisConnect With a Mentor Commented:
In Outlook 2002, when you try to open an e-mail message that you saved in Outlook 2003, you receive "The messaging interface" error when the e-mail message that you are trying to read is encoded in Unicode format. So it sounds like the client is trying to open a unicode msg he saved from Outlook 2003 at home in the non-unicode Outlook XP that he uses at work. By the way, Outlook 2002 is also non-unicode.

I say this because why else would someone need to save an email at all like this unless they were transporting it between two places, such as between home and work. If you use non-unicode Outlook at work, and he has unicode Outlook at home, he is probably saving emails that he feels he needs for work onto a floppy or something like, or emailing it to himself. But it's strange because he could simply forward the email to his work address. There's something that he/she is doing in terms of workflow that probably needs to be addressed. But the unicode issue is very easy to workaround: Simply, when he'she saves the e-mail message in Outlook 2003, use a non-Unicode format.

To do this, follow these steps:
1.      In Outlook 2003, click the e-mail message that you want to save.
2.      On the File menu, click Save As.
3.      In the Save in box, click the location where you want to save the file.
4.      In the File name box, type a name for the file.
5.      In the Save as type box, click any file type except Outlook Message Format - Unicode, and then click Save.
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