This is good and bad news. Good, I am fed up with the way Windows and controls are drawn. If all of this is changed, it also means that the CLR Winforms will also drastically change since today it hardcodes WIN32 plumbing. The OS will have to come with another .NET major run-time. Bad, applications will have to be written for that OS, and won't work on others. If that is true, don't expect corporate people to switch to it. There could be an emulator sold along, but... Longhorn is not an OS, it's a whole new PC : - new and breaking hardware (NGSCB chip, new display cards, ...) - new and breaking OS - new and breaking .NET run-time - new and breaking compilers and dev tools - new and breaking apps