Windows allows you to store multiple e‑mail addresses for your contacts. You can set any of these e‑mail addresses as the preferred (default) e‑mail address to use for a contact.
Open Windows Contacts by clicking the Start button , clicking All Programs, and then clicking Windows Contacts.
Double-click the contact you want to change.
On the Name and E‑mail tab, click the e‑mail address that you want to set as the preferred (default) address, click Set Preferred, and then click OK. (If there is only one e‑mail address, it will automatically be set as preferred.)
The preferred e‑mail address is the e‑mail address that Windows Mail will use if you right-click a contact, point to Action, and then click Send E‑mail. This opens a new e‑mail message with the preferred e‑mail address automatically entered in the To box. This is also the preferred e‑mail address that will be selected by some other e‑mail programs that work with Windows Contacts.