Rated 1 out of 5 stars

Installed the plugin but the winmail.dat stays just that, an unrecognised attachment.
Found WinMail reader that I managed to program to open the attachment when it is double clicked in Thunderbird.
Any other advice?

This review is for a previous version of the add-on (1.2.7). 

If you would like help you should probably be writing to the mailing list. Asside from that please let me know your version number of Thunderbird and LookOut. Open the "Error Console" under the Tools menu and see if there are any messages related to LookOut or Tnef.