The .NET Compact Framework v3.5 Beta1 was shipped in Orcas Beta1 allowing developers to try out NETCF's new features, except for the Store and Forward Transport which has a strong name signing issue.  This issue stops compilation of Smart Device projects referencing Microsoft.ServiceModel.Channels.Mail.dll and or Microsoft.ServiceModel.Channels.Mail.WindowsMobile.dll.  We have fixed this issue and are making the fix available through the end user download.  If you’re trying the Store and Forward Channel out, first uninstall .NET Compact Framework v3.5 Pre-Release then install it from http://www.microsoft.com/downloads/details.aspx?FamilyID=1343d537-a62f-4a6e-9727-7791bf4cc2bd&DisplayLang=en