This is in reply to query posted by reader that
I have configured Outlook.com as pop account in external email reader and deleting email messages in external reader still retains the copy in Outlook.com
If you have similar problem then you can follow the below mentioned steps to fix it.
Step 1: Click Settings icon and select More mail settings from the list.
Step 2: In Outlook.com Options screen, navigate to Managing your account section and click POP and deleting downloaded messages option.
Step 3: Now for the POP and deleting downloaded messages Option, select “Do what my other program says – if says to delete messages, then delete them.” Then click the Save button to confirm and apply the changes.
This would ensure that if you delete emails from program that has been configured to POP download messages, will delete the emails from Outlook as well.