I just finished installing: Windows Vista September 05 CTP (Build 5219) WinFX + SDK September 05 CTP Visual Studio 2005 Beta 2 WinFX Extensions September 05 CTP for VS 2005 Except VS 2005 Testing features, which are not working for me in Beta 2, everything works fine. But I hope that next Vista drops will support more recent VS 2005 drops because some time has gone since Beta 2 release. First of all I recognized that there is no more Avalon Navigation Application. You can only choose between Avalon Application and Avalon Web Application (runs in browser). But you can easily create an Avalon Application and set the StartUpUri Tag in MyApp.xaml to your Start Page to provide Avalon Navigation. Second thing to mention is that some namings and locations changed (Events, Classes, etc.) IValueConverter can now be found at System.ComponentModel System.Windows.Data.ObservableCollection can be found at System.Collections.ObjectModel TextBlock 's TextContent changed to Text Windows 's Tex...