Does Zoho CRM overwrite information when syncing contacts from Outlook?

Does Zoho CRM overwrite information when syncing contacts from Outlook?

Hello there,  

I'm currently syncing my contacts from Outlook into Zoho CRM. I know that duplicates are checked based on the email id. 

However, when you sync a contact from Outlook which is already in Zoho CRM, does Zoho CRM skip the duplicate contact or it just overwrites the information in Zoho CRM?

 

Or:

 

Imagine that in my Outlook I have a contact and my colleague has the same contact in his/her Outlook. The email id is the same but the rest of the contact information is different. 

When we both sync our contacts, what would the syncing do - is it going to overwrite the information in Zoho CRM or is it going to skip the synchronization? 

 

Your help is much appreciated.  Thank you!