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Decoding winmail.dat attachment

From time to time, I receive email with attachment "winmail.dat". This is because the sender is using Microsoft Outlook. It encodes attachment into a proprietary format (TNEF) making other e-mail clients fail to display the content correctly. Interestingly, this includes Microsoft Outlook Express.

A quick Google research solves the issue.

Thunderbird - use an add-on called Lookout. It decodes winmail.dat automatically in the background and put the attachment in the attachment pane.

Mac OS X - use TNEF2.0 which is a free decoder written by Josh Jacob.

Windows - use freeware Winmail Opener.
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