It’s common to own more than one email addresses in modern times. But how could you add more than one email addresses for contacts in your Outlook? This article will introduce a couple of methods to solve this problem.
This method will guide you to add multiple email addresses for one contact in people view of Outlook 2013/2016. Please do as follows:
1. Open the contact folder containing the specified contact, and change folder view with clicking View > Change View > People.
2. Click the specified contact to preview it in the reading pane, and then click Edit. See screenshot:
3. Click 
button to add an email box, and type a new email address into it. See screenshot:
Notes:
(1) For adding the third email address, please repeat this step again.
(2) One contact is entitled to no more than three email addresses in Outlook.
4. Click the Save button at the bottom of the reading pane.
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If you want to add multiple email addresses for a new contact or add multiple email addresses for existing contacts in Phone/List/Card view, please do as follows:
1. Open the contact folder, and change its view by clicking View > Change View > Business card / Card / Phone / List as you need. See screenshot:
2. Please create a new contact by clicking Home > New Contact, or open an existing contact by double clicking.
3. In the Contact window, please click arrow 
beside E-mail field, select E-mail 2 from drop down list, and type the second email address into right box.
Note: For adding the third email address, please click arrow beside E-mail field, select E-mail 3 from drop down list, and type the third email address into the right box.
4. Make other changes as you need, and then click Contact > Save & Close to save the changes.
