If you accidentally delete a contact or a contact list in Outlook on the web, you can restore the contact or contact list if it's still in your Deleted folder on the People page. In some cases, you can even recover a contact or contact list after it's removed from the Deleted folder.
Note: To go to the People page, sign in to Outlook on the web and select the People icon 
When you delete a contact or a contact list, it's moved to the Deleted folder.
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On the People page, in the left pane, select the Deleted folder.
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Select the contact you want to restore, and select Restore.
If you can't find a contact in the Deleted folder, the next place to look is the Recoverable folder.
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On the People page, in the left pane, select the Deleted folder.
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At the top of the list, select Recover deleted.
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Select the contacts you want to recover, and select Restore.
Where do recovered contacts go? The contacts you select to recover will be restored to their original folders when possible. If an original folder no longer exists, the contacts are restored to your default Contacts folder.
