I am on Windows Live Mail beta!
And the service looks and feels great! I am so used to using Microsoft Outlook (it is the best e-mail client, without a doubt), that I normally don’t use web interfaces for e-mail at all. But Windows Live Mail is so well done that you feel like using it, just for the sake of using it :).
Features list of Windows Live Mail:
If you want to use it, sign up for the beta here: