Rated 3 out of 5 stars

TBSync in TBvs78 works great with MSExchange account, but having major issues with Google account.
1. Contact variable names are string of letters (eg "_DAV4TBSYNCMSG-abCard.PrefixName") rather than usual names, I cant add telephones or emails addresses and contacts added in TB3 arent synced to primary google account.
2. Calendar works fine initially but when I exit and reopen TB3 the calendar is disabled, and I have to unsubscribe and resubscribe each time. (I use 2 factor password - is that an issue)

This review is for a previous version of the add-on (2.16). 

Known issue and already reported on the developer page.