Deleting faulty email address from Outlook.com's memory

Hello,

I realize the inconvenience you are facing. We will help you.

To assist you better, I suggest you to answer the below questions.

1. Are you accessing the account through browser or through Application?
2. Are you using Office application, if yes which version are you using?
3. Did you make any recent changes prior to the issue?

I suggest you to refer the below link and check if it helps you resolving the contact deletion issue.

Refer: Contact list management in Outlook.com

Please post to us with the information to help you better.

Thank you for your response.

To your questions;

1. I use a web browser.

2. I am not using Office.

3. No recent changes, prior to issue.

Hello,

Thank you for keeping us updated.

Are you trying to delete the contacts from the system or from the Outlook Mail account?

Where exactly the contacts are not displayed for you to delete?

Please post to us with more information to help you better.

Open a new email.

Type a few letters of the bad address.

Put the mouse cursor over the address/name in the drop down box.

A X will appear.

Click on the X.