link contacts with emails

Hello! I have done some investigating online and it sounds like MS removed the linking feature that allowed a user to link a contact card to the emails received or sent to that contact as well as appointments that included the contact. What I want to be able to do is link a contact so that...

could you please assist? I would like to link my contacts with their emails and see the emails within my custom contact's form. In this form i have put a nickname for each one contact, which matches with a custom field named: "PERSON" in each one email