Rated 5 out of 5 stars

Installed OK - using remote owncloud server, starts to download contacts then seemed to get "stuck" syncing - tried an earlier version and it did the same

After the developer suggested I emailed him with a log the issue was solved within a few hours!! (it was an issue my end with a couple of rogue contacts..not the softwares fault!)

Very impressed with the functions / speed and support!
Integrates beautifully with my owncloud server and Thunderbird addressbook - does exactly as it says on the tin :D :D
Thanks

This review is for a previous version of the add-on (12.9). 

by email please : cardbook.thunderbird@gmail.com :O)