I have 2 computers and I have Windows Live Mail installed on both.  One is a laptop running Windows 7 and the other, newer machine, is a desktop running Windows 8.1.   I do not like the Windows 8 Mail app but did like the Windows Live Mail that I had on my laptop so I installed the Windows Live Mail on the new Windows 8.1 Desktop.  

I have 2 Microsoft Mail Accounts - One is a Hotmail.com account and the other is a "Live.com"  account, and I have two other pop mail accounts.  

I have successfully added all 4 accounts to the Live Mail client on the Windows 81 computer and everything is working fine.  However, on the Windows 7 Laptop, I cannot get one of the pop mail accounts to work.  Both pop  mail accounts are through the same provider and actually have the same passwords but the one account keeps telling me the password is invalid.

I have checked and rechecked all of the settings and passwords for both pop mail accounts and they are set up exactly the same on each computer, so I cannot figure out why the one account is responding properly and the other does not.

Anyone have any ideas about this strange situation?