How are my contact databases matched to establish the sync?

  • To establish a sync, we match contacts between two apps based on the email address field: 

The sync or 'binding' we establish between two apps during the initial sync, will stay in place once the sync is active, regardless of the changes you make to the contact after, even on the email address level. 

  • What to do when you have contacts without an email address?

Have a look here to see how you best move forward, in particular with our Avoid Duplicates feature

In some cases, one or both apps will have a List Type Field established for the email address. Have a look here to see how this will translate in the sync.