Suddenly, my Live Mail doesn't send or receive email. I receive the following error message:

Unable to send or receive messages for the Windows Live Hotmail account. Header download for the 'Inbox' folder did not complete. XOAUTH authentication failed. None of the authentication methods supported by your IMAP server (if any) are supported on this computer.

Server Response: Your IMAP command could not be sent to the server, due to non-network errors. This could, for example, indicate a lack of memory on your system.
Server: 'imap.gmail.com'
Windows Live Mail Error ID: 0x800CCC0F
Protocol: IMAP
Port: 993
Secure(SSL): Yes

What's going on?