The only other thing I can suggest is that you delete the account on Windows Live Mail and set it up again. There is no guarantee that this will cure the problem It could be a BT problem.
Because you have it set up as a POP3 account , if you decide to do that you will need to back up your email folders or you will lose any emails you have on your computer.
If you've installed Windows Live Mail in Vista or Windows 7, chances are your email is stored in subfolders of C:\Users\ logon \AppData\Local\Microsoft\Windows Live Mail, where logon is the name you use to log onto Windows.
If you installed Windows Live Mail into XP, the path is probably C:\Documents and Settings\ logon \Local Settings\Application Data\Microsoft\Windows Live Mail.
Once you have located these folders you will need to make a copy of them and save them in a new folder so that you can access them later. Once you have set up the account again you will need to go back to where you found the folders above and copy them into the new account.
If you are not confident in being able to do that you should check that the emails you want are still on the BTMail server by logging onto your BTMail account. If they are all there, when delete and set up your email account on Windows Live Mail they will all download again if the problem has been sorted. Obviously any emails that are not there will not be downloaded and will be lost if you don't do the back up method.
