Hotmail has updated its security features to help further safeguard your account against phishing attacks and hijacking attempts with mobile phone number verification and trusted computers.
Hotmail now has a three-prong security system in place. The first prong is the original alternative email system which is now joined by mobile phone verification — available for users inside and outside of the US — and a "trusted PC" system. Users running Windows and using Windows Live Essentials can link their PC to their Hotmail account for an added layer of identity verification.
While you're thinking about security, make sure to check out some of our past features on password security like Your Passwords Aren't As Secure As You Think; Here's How to Fix That and How to Update Your Insecure Passwords and Make Them Easy to Use.
Hotmail Security Updates Protect You From Account Hijackers [The Windows Blog]