Rated 2 out of 5 stars

I installed it in 2.0.0.17
It would not open a winmail.dat file with IPM.Microsoft Mail.Note in the header.

Yes in the error console appears three times:
dialog has no properties

chrom://mozapps/content/downloads/unknownContentType.xul

This review is for a previous version of the add-on (1.2.3). 

Were there any messages in the error console?