Even with the popularity of the Email services like Yahoo and GMail dominating the web-based email service marketplace, Hotmail is still used by plenty of users worldwide.
To make its services more secured, Hotmail has now allowed its users to let their passwords expire after 72 hours, if they opt for it. This may sound as added hassles for many of the users, but if you are really concerned about the security of the passwords, then this is for you. Opting this option, will require you to reset your password after 72 hours.
You can use this link to use this hotmail security feature.