I just got invited to use Windows Live Mail Beta. I signed in with my Hotmail account. My first impression was that the interface is cool! The reading pane and drag-n-drop option are great. It is the first time I could use drag-n-drop and resizing in a browser. It offers 2 GB mail space too. Despite these exciting features, I doubt whether it can beat the growing popularity of Gmail or not. The notion of mail conversation introduced by Gmail is unique. I think Yahoo Mail's simplicity and reliability to filter spams and Gmail's conversation approach coupled with ever increasing mail box size will keep still them ahead of Live Mail.