uSoft disabled Winmail in win 7 - they want you to use Windows Live. So options:
(1) use Windows Live mail - everything stored on the net -Sorry, stuff it uSoft.
(2) use a 3rd party program like Thunderbird
(3) Port a copy of Vista Winmail in to windows 7 - Involved but works, This is what I did for wife's computer. Can find procedure on internet, google using Vista winmail in windows 7.
(4) Use Microsoft Outlook (This is not Outlook express) which is included in Higher end versions of Microsoft office. This is what I did for my computer