I developed this problem as well yesterday 5/8/14. My windows live still downloads my other email accounts, just not my .msn email. My phone and tablet still work, but my laptop that stays at home is the primary one I use. Also the .msn is the primary email account that I use to to start using one of the others and tell everyone to forget my .msn email and start using a different one will be a big pain. I  have tried to delete the account and reinstall it. Now I just get a message the says "windows live mail is trying to synchronize your account. check back in a few minutes to read your messages"

<Split from: http://answers.microsoft.com/en-us/windowslive/forum/livemail-sync/hotmail-will-not-sync-in-windows-live-mail/40092fd3-4a00-466f-82a1-163e881e34ff?page=2 >