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Hotmail (Outlook) denied POP3 access from Gmail

Recently, my Gmail failed to access my hotmail via POP3:
Server denied POP3 access for the given username and password.
Please contact Microsoft's Support Team for more information on POP access.
Server returned error: "Authentication failure: unknown user name or bad password. [Error="ProxyNotAuthenticated" AuthResult=0]"

It was working fine for a few years. Suddenly stopped working. I searched and found the reason: Microsoft turned off POP3 access on my account without any notification. So turning it back on solved the problem:
For more details, see here