Extract winmail.dat files in linux

Source: http://www.faqforge.com/linux/how-to-open-winmail-dat-files-on-ubuntu-or-debian-linux/

The winmail.dat file is a container file format used by Microsoft Outlook to send attachments in richtext formatted emails. To open winmail.dat on Linux, use the tnef utility.
Installation

sudo apt-get install tnef

Usage
Open a shell window, navigate to the directory where the winmail.dat file is saved, then execute the command:

tnef winmail.dat

to extract all files that are stored in the winmail.dat into the current directory.