One of my accounts in Windows Live Mail is not downloading all of my email. My Windows Live and Gmail accounts seem to be working properly. However I have a POP account that is not. Here is what is happening.

When I get a new email message from that not working account I see the bold (1) in brackets beside the inbox indicator but the message itself does not appear. When I go to the POP webmail account I can read the message. It is there. I have subsequently marked all of my messages as "unread" and I get 45 unread messages. This corresponds to the number when I use Webmail to access my POP account. The messages that are not downloading do not correspond to any specific time period. They are random dates, although since Feb 28 no new messages have been downloaded.

I have used the uninstall tool on the control panel to repair Windows Essentials and I have also removed and re-added the account in question that is not working properly. Still the problem persists.

What is the problem and how can it be repaired?

Thanks