Private Contacts in Outlook sync with CRM

 Hi, I have a question, I know you can use the Pim Sync Software to sync your Outlook with the CRM.

But I use Outlook to add contacts that are private, and I dont want them to sync to the CRM.
I know in the CRM you have a checkbox named private, but I prefer to not sync from the Outlook these contacts.

How can I do it?

Thanks