Rated 3 out of 5 stars

I cannot manage to understand what this add-on is meant for... Think more about non-geek users... Explain more please.

This review is for a previous version of the add-on (5.3). 

This add-on reads the winmail.dat attachment file that Microsoft email servers might send if they have been miss-configured. The winmail.dat is a proprietary Microsoft email format.

Edit: I have updated the description and hope it is clearer now.