This is part of a series on New WPF Features
In earlier versions, on trying to deploy a Full Trust Xbap, you would get a "Trust Not Granted" error. Its possible to workaround this issue by installing an assembly in the GAC that has the AllowPartiallyTrustedCallersAttribute. Another option is to install a certificate on the user machine and sign the Xbap with the certificate. Yeah, its painful and we worked on this issue for this release
Now on deployment, you would get a clickonce dialog so that the user can determine if s\he want to run the Xbap. This is really beneficial in the case of Intranet deployment. Do I hear a WOW.. 🙂
Below is the pictorial difference..
In addition, clicking on the More Information link open up a dialog with additional information that would enable the user to make a more knowledgeable decision about installation