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E-mail attachments from Microsoft Outlook
If you use Microsoft Outlook (not Outlook Express) to send and receive e-mail, and you send a message with attachments to someone who doesn't use Outlook to read their e-mail, the recipient may find that your attachments are missing from your message.
This common problem occurs because the recipient's e-mail program doesn't understand MS Outlook's method of packaging the attached files — Transport Neutral Encapsulation Format (TNEF).
To resolve this problem, set the default e-mail format for the recipient to either plain text or to Hypertext Markup Language (HTML) and then send a new message with your attachments.
Click here for more information about TNEF attachments and changing the e-mail format in MS Outlook
Tech Tip: People on the receiving side of this problem may get a a message with an attachment named Winmail.dat or ATT00001.DAT, or a file with the MIME type "application/ms-tnef". You may be able to save this file and extract the original attachments by using a free MS-TNEF helper application called "Fentun" available on the internet. For more information, visit www.fentun.com.