http://developers.de/blogs/armin_kalajdzija/archive/2010/10/06/how-to-install-self-issued-certificate-on-windows-phone-7.aspxFor all of you that are using Exchange Server with Self-Issued Certificate, when syncing you Windows Phone 7 with your Exchange Account, you will get the Error Message saying Attention is Required and that Certificate is not Signed . As we know, thereenCommunityServer 2008 SP1 (Build: 30619.63)