If some messages arrive from the Internet looking like
scrambled eggs, then you need to save each one as a file,
then decode it. This is much less of a problem with
Outlook than it was with Microsoft Exchange/Windows
Messaging.
Winmail Opener is a small and simple utility that allows users to view and extract contents of TNEF-encoded messages (winmail.dat). Version 1.4 - Free.
Includes UUencode, BinHex and MIME support, so you can extract attachments from messages that you've saved as files.
Notes
If other people complain that your messages arrive
with gibberish or a mysterious WINMAIL.DAT file, then
try Rich-Text
Sentry (Microsoft Exchange and Windows Messaging
Only) to prevent messages from leaking out in
rich-text format.