Rated 1 out of 5 stars

C'mon Guys,
On YOUR website you feature "FileLink provider for WebDAV" as a provider for linking attachments, then won't let me install it because it's unsigned. Let's get our act together here.

This review is for a previous version of the add-on (3). 

Thunderbird add-ons do not require signing. Install this by searching for it in the Add-ons Manager in Thunderbird and it installs with no trouble on 91.*