When you delete a contact in Outlook, it is moved to the Deleted Items folder. You can restore contacts from the Deleted Items folder by following these steps:
1. In Outlook, go to the Deleted Items folder.
2. Right-click on the contact you want to restore and select Move > Other Folder.
3. In the Move Item window that appears, select the Contacts folder as the destination and click OK.
4. The contact will now be restored to your Contacts folder.