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Problems with winmail.dat as attachment.  Why do I get att1.unk or winmail.dat attachments?

These attachments are sent from users of a Microsoft email system. The att1.unk file is received by our mail server if the original message was transmitted with MIME encoding. The winmail.dat file is received if the Microsoft email system UUEncodes the message.

Here are some links for more information:
http://officeupdate.microsoft.com/2000/articles/Olmsgfrmtprobs.htm

http://support.microsoft.com/support/kb/articles/q136/2/04.asp