You can delete contacts or contact lists that you created or imported into Outlook on the web. You can't delete contacts that you get by connecting to a social network account, such as LinkedIn.
You can recover contacts and contact lists that you deleted less than 30 days ago. When you recover a contact or contact list, Outlook on the web automatically places it in the My Contacts folder.
To delete a contact or contact list
- Go to the People section via the icon below the calendar icon on the left (demonstrated in the screenshot below):

- Select the contact or contact list.
- Click on Delete at the top then click Delete again to confirm.
To restore a contact or contact list
- Go to the People section.
- Go to Deleted on the left
- Click on a contact or contact list that you want to restore.
- Click Restore (either at the top, or on the right).