I use Windows Live Mail to manage multiple email accounts, all of which are Microsoft accounts (MSN.com, Live.com, Outlook.com).  About a week ago I noticed that one of the accounts was not updating.  I deleted it and re-added it.  Things seem to work fine.  Now a second one is not updating.  So instead of deleting it, I just added it a second time.  The second instance of this second email account is updating, but the original one is not.

I don't really want to uninstall and reinstall, nor do I want to add multiple instances of each email account.

Anyone have any ideas?

I'm running Windows 8.1 Pro fwiw.