I am running Windows Essential's Windows Live Mail 2012 under 64 bit Windows 7 Professional Service Pack 1. It is configured to my yahoo account using POP3 and SMTP. I am able to send and receive EMail before installing WLMailApi v220.127.116.1115 trial copy. After the installation, whenever I start Windows Live Mail it would immediately crash after clicking on the "OK" button in the "Evaluation Period: 30 days remaining " dialog box. Once WLMailApi has been uninstalled Windows Live Mail doesn't crash.