I noted that Karbon can import office 365 contact. Before I try it, anyone has the experience of the contact syncing from office 365 for following questions?

• If I hit the button, will current existing contact in Karbon lost or replaced by the imported office 365 cotact? Or the imported office 365 contact will be added as additional contact? 
• Is it possible to double-way syncing contact with office 365? ie, if I update any details of the contact or add a new contact in Karbon, it will be synced back to office 365?