Rated 1 out of 5 stars

You might say who cares, but not me. I have an addressbook with people who don't have some emails and when trying to "sync" / upload them to google via this Zindus plugin, google pukes and says that the entries are empty. So I guess it's not really Zindus' fault, but it sure ain't a solution for me.

This review is for a previous version of the add-on (0.7.8). 

Hi Danshu, Thunderbird and Google contact fields don't match exactly. So like you say, you can have a perfectly reasonable Thunderbird contact that maps to a completely empty Google contact. And vice versa. Those contacts can't be synced.

The easiest workaround is to give them an email address - even a fake one is ok.