I'm 99.9% certain that my Hotmail issue has nothing to do with my S4, but figured I might as well ask: "has anyone run into an issue with signing into hotmail after setting it up? Specifically, from time-to-time I get a "sign-in failed" alert that says "Server password has changed. Enter the new password." The password has not changed--I'm able to log into my Hotmail account via other devices using the same password and given time it goes back to "normal".