As far as I am aware, I made all of the required changes.
Perhaps you could just tell me this to let me know if I have read the original post correctly:
Does a customer with an ntlworld email address have to change their POP3 server name from pop3.ntlworld.com to pop3.virginmedia.com and their SMTP server name from smtp.ntlworld.com to smtp.virginmedia.com?
Even before reaching its end of life there were increasing problems with Live Mail. For example, the feature that integrated Live Mail and one drive has been broken meaning it's default way of getting pictures into an email no longer works. It' possible to insert pictures as attachments, but this feature still catches users out.
In addition, Microsoft ended the connector service that allowed live mail to access Exchange accounts, forcing users of Hotmail and other Microsoft services to either switch mail programs or change to using IMAP to retain some functionality, but lose the calendar integration.
In short, you are using an increasingly broken product, and it's not going to get any better.
However, if you still wish to use Windows Live Mail 2012 - YOU MUST MAKE SURE YOU@VE CHANGED ALL THE REQUIRED SETTINGS.
In the Servers Tab
In the Advanced Tab
You MUST make sure that the port numbers and SSL settings match the image above. You can use different settings in the delivery section if you wish, but note that Virgin's implementation of POP3 only hides emails from future POP exchanges rather than deletes them altogether when they are "removed" from the server. They are still accessible over IMAP and Webmail.
Note: that if you access your emails using multiple devices POP3 is NOT the best option anyway. You'd be better off switching to IMAP.
Only use Helpful answer if your problems been solved.